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    Electromagnetic Waves - Notes, Topics, Types, Formulas, Books, FAQs

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    Electromagnetic Waves - Notes, Topics, Types, Formulas, Books, FAQs

    Edited By Team Careers360 | Updated on May 06, 2022 08:20 AM IST

    Wave is nothing but a pattern of disturbance which propagates and carry energy with it. You can produce a wave on a rope by moving one end of the rope up and down. The wave produces on rope needs a medium to propagate and here medium is rope itself. This type of waves is known as mechanical waves. But in the case of Electromagnetic waves, they don't need a medium to propagate. Electromagnetic waves are waves that are created as a result of variations of electric field and a magnetic field. Or we can say that Electromagnetic waves are nothing but changing magnetic and electric fields. Electromagnetic waves are also known to be solutions of Maxwell's equations. And Maxwell's equations are the fundamental equations of electrodynamics. Electromagnetic waves can transmit energy and travel through a vacuum. light waves are examples of electromagnetic waves. Generally, Electromagnetic waves are shown by a sinusoidal graph.

    electric%20magnietic%20waves

    As shown in figure Electromagnetic waves consist of time-varying electric and magnetic fields and they are perpendicular to each other And these both fields are also perpendicular to the direction of propagation of waves. And because of this Electromagnetic waves are transverse in nature.

    Electromagnetic waves are one of the most important chapters from modern physics while preparing for all competitive exam because it helps you to understand the important properties of Electromagnetic waves. This chapter will also help you to understand various types of Electromagnetic waves and their applications. This is easy to understand and a high scoring topic. Sometimes the Concept of Electromagnetic waves and other chapters of physics are mixed in miscellaneous questions which are asked in various competitive exams.

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    Notes on the Electromagnetic waves

    So we will discuss step by step about important topics from this chapter followed by an overview of this chapter. Then we will understand important formulas from this chapter. Remembering these formulas will increase your speed while question-solving.

    Electromagnetic waves Topics

    Electromagnetic waves Overview

    In Electromagnetic waves chapter, we will learn Electromagnetic waves, their all the important properties, their types, and their applications. So we will learn about

    • Maxwell’s Equations - As Electromagnetic waves are also solutions of Maxwell's equations. So it important to learn about them. James C. Maxwell noticed an inconsistency in Ampere’s Law and an asymmetry in the laws of electromagnetism. So he provided some suggestions in these laws. For example, he suggested the idea of Displacement current to remove this inconsistency in Ampere’s Law. Thus he provided a modified version of these laws with the help of Maxwell's equations which are given below-

    1. Maxwell's 1st equation -Gauss's Law for electrostatics

    2. Maxwell's 2nd equation: Gauss’s Law in Magnetism

    3. Maxwell's 3rd equation-Faraday's law

    4. Maxwell's 4th equation-Ampere's law

    • Electromagnetic waves properties-

    1. These waves do not require a medium for propagation and they are transverse in nature.

    2. These waves propagate through space with the speed of light in vacuum.

    3. The wave having higher the frequency, will have the higher energy associated with it.

    4. It can be used to carry information.

    5. It travels in straight lines.

    6. It can be split and recombined to form interference / Diffraction pattern.

    7. It can be reflected or refracted.

    • Electromagnetic Wave Equation-

    One of the very important types of electromagnetic waves is sinusoidal plane waves. All electromagnetic waves can be considered as a linear superposition of sinusoidal plane waves traveling in arbitrary directions.

    For example- A plane wave traveling in the x-direction is of the form

    And if E is in the y-z plane then

    E= E_{o} Sin w (t -\frac{x}{c})

    Where E - Electric field at (x,t)

    E_0 - Electric field amplitude

    \omega= Angular frequency

    c= Speed of light in vacuum

    Similarly, B is in the y-z plane

    B=B_{o} Sinw (t-\frac{x}{c})

    Where B = Magnetic field at (x,t)

    B_0= Magnetic field amplitude

    • The important physical quantity of Electromagnetic waves

    NCERT Notes Subject Wise Link:

    You will learn about some physical quantity given below-

    1. The intensity of Electromagnetic wave

    2. The momentum of Electromagnetic wave

    3. The energy density of Electromagnetic wave

    4. The wavelength of Electromagnetic Wave

    5. Frequency of Electromagnetic wave

    Types of Electromagnetic wave and their applications

    Depending on the range of frequency of wave there are various types of Electromagnetic wave. And these waves have various applications in our day to day life. Following are some types of Electromagnetic wave

    1. γ - Ray (Gamma Ray)- Useful in In detecting a fault, crack, flaws, holes in metals.

    2. X Rays- Useful in X-Ray therapy.

    3. Ultraviolet Radiation- Helps In the study of molecular structure.

    4. Infrared Waves- Helps for taking photographs in fog or smoke

    5. Microwaves-These are used in radio and TV communication.

    Electromagnetic Waves Formulas

    • Wave Equation-

    E= E_{o} Sin w (t -\frac{x}{c})

    E is in the y-z plane

    B=B_{o} Sinw (t-\frac{x}{c})

    B is in the y-z plane

    • Maxwell's Displacement Current-

    i_{d}=\varepsilon _{o}.\frac{d\phi _{E}}{dt}

    • Gauss's Law for electricity-

    \oint \vec{E}. d\vec{s}=\frac{q}{\epsilon _{o}}

    • Gauss's law for magnetism-

    \oint \vec{B}.\vec{dS}=0

    • Faraday's law-

    \int \vec{E}.\vec{dl}=\frac{-d\phi_{B}}{dt}

    • Ampere's law-

    \oint\vec{B}.\vec{dl}=\mu_{o}i+\mu_{o}\epsilon _{o}\frac{d\phi_{E}}{dt}

    • The relation between E_0 and B_0-

    E_{o}=c.B_{o}

    • The energy density of EM wave-

    \mu =\frac{1}{2} \epsilon _{o}E^{2}+ \frac{B^{2}}{2\mu_{o}}

    • The intensity of EM wave-

    I = \frac{1}{2} \epsilon _{o} E_{o}^{2}c

    • The momentum of EM wave-

    p = \frac{u}{c}

    How to prepare Electromagnetic waves

    • First, you should have good command over the concepts of Electromagnetic waves and you should also know how to apply them well at the time of the entrance exam or while solving questions.
    • Please try to understand each concept from this chapter, with the help of theory, questions with solutions and video lectures on each important concept.
    • For each concept practice enough problems so that you have a thorough understanding of the concept.
    • Solve all the questions at home with proper concentration and try to do all calculation by yourself without seeing the solution first.
    • While solving questions of wave equation you should also consider the direction of corresponding vectors.
    • Please have a thorough knowledge of Electromagnetic wave spectrum and application of various Electromagnetic waves.
    • Remember all the formulas of Energy, momentum, frequency of Electromagnetic waves. This will help you while solving questions.

    NCERT Solutions Subject wise link:

    NCERT Exemplar Solutions Subject wise link:

    Electromagnetic Waves Tips

    • Make a plan to prepare for this chapter and Stick to a Timetable.
    • Make smart and realistic goals and try to achieve them.

    waves tips

    • Study the concept first and then start solving questions. Don't go through question directly without knowing the concept.
    • Formulas from this chapter are very important from the point of view of competitive exam. So please remember them and solve lots of questions based on these formulas.
    • Solve previous year question of various exam from this chapter.
    • Use smart methods to solve questions.

    Electromagnetic Waves Books

    For Electromagnetic Waves, chapter concepts in NCERT are enough but you will have to practice lots of questions including previous year questions and you can follow other standard books available for competitive exam preparation like Concepts of Physics (H. C. Verma) and Understanding Physics by D. C. Pandey (Arihant Publications).

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     5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C.  If Na2SO4 is 81.5% ionised, the value of x (Kf for water=1.860C kg mol−1) is approximately : (molar mass of S=32 g mol−1 and that of Na=23 g mol−1)
    Option: 1  15 g
    Option: 2  25 g
    Option: 3  45 g
    Option: 4  65 g  
     

     50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl.  If pKb of ammonia solution is 4.75, the pH of the mixture will be :
    Option: 1 3.75
    Option: 2 4.75
    Option: 3 8.25
    Option: 4 9.25
     

    CH_3-CH=CH-CH_3+Br_2\overset{CCl_4}{\rightarrow}A

    What is A?

    Option: 1

    CH_3-CH(Br)-CH_2-CH_3


    Option: 2

    CH_3-CH(Br)-CH(Br)-CH_3


    Option: 3

    CH_3-CH_2-CH_2-CH_2Br


    Option: 4

    None


    \mathrm{NaNO_{3}} when heated gives a white solid A and two gases B and C. B and C are two important atmospheric gases. What is A, B and C ?

    Option: 1

    \mathrm{A}: \mathrm{NaNO}_2 \mathrm{~B}: \mathrm{O}_2 \mathrm{C}: \mathrm{N}_2


    Option: 2

    A: \mathrm{Na}_2 \mathrm{OB}: \mathrm{O}_2 \mathrm{C}: \mathrm{N}_2


    Option: 3

    A: \mathrm{NaNO}_2 \mathrm{~B}: \mathrm{O}_2 \mathrm{C}: \mathrm{Cl}_2


    Option: 4

    \mathrm{A}: \mathrm{Na}_2 \mathrm{OB}: \mathrm{O}_2 \mathrm{C}: \mathrm{Cl}_2


    C_1+2 C_2+3 C_3+\ldots .n C_n=

    Option: 1

    2^n


    Option: 2

    \text { n. } 2^n


    Option: 3

    \text { n. } 2^{n-1}


    Option: 4

    n \cdot 2^{n+1}


     

    A capacitor is made of two square plates each of side 'a' making a very small angle \alpha between them, as shown in the figure. The capacitance will be close to : 
    Option: 1 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{\alpha a }{4 d } \right )

    Option: 2 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 + \frac{\alpha a }{4 d } \right )

    Option: 3 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{\alpha a }{2 d } \right )

    Option: 4 \frac{\epsilon _{0}a^{2}}{d}\left ( 1 - \frac{3 \alpha a }{2 d } \right )
     

     Among the following compounds, the increasing order of their basic strength is
    Option: 1  (I) < (II) < (IV) < (III)
    Option: 2  (I) < (II) < (III) < (IV)
    Option: 3  (II) < (I) < (IV) < (III)
    Option: 4  (II) < (I) < (III) < (IV)
     

     An ideal gas undergoes a quasi static, reversible process in which its molar heat capacity C remains constant.  If during  this process the relation of pressure P and volume V is given by PVn=constant,  then n is given by (Here CP and CV are molar specific heat at constant pressure and constant volume, respectively)
    Option: 1  n=\frac{C_{p}}{C_{v}}


    Option: 2  n=\frac{C-C_{p}}{C-C_{v}}


    Option: 3 n=\frac{C_{p}-C}{C-C_{v}}

    Option: 4  n=\frac{C-C_{v}}{C-C_{p}}
     

    As shown in the figure, a battery of emf \epsilon is connected to an inductor L and resistance R in series. The switch is closed at t = 0. The total charge that flows from the battery, between t = 0 and t = tc (tc is the time constant of the circuit ) is : 


    Option: 1 \frac{\epsilon L }{R^{2}} \left ( 1 - \frac{1}{e} \right )
    Option: 2 \frac{\epsilon L }{R^{2}}


    Option: 3 \frac{\epsilon R }{eL^{2}}

    Option: 4 \frac{\epsilon L }{eR^{2}}
     

    As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed  of the particle at B is x m/s. (Take g = 10 m/s2 ) The value of 'x' to the nearest is ___________.
    Option: 1 10
    Option: 2 20
    Option: 3 40
    Option: 4 15

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    In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion. Ever since internet cost got reduced the viewership for these types of content has increased on a large scale. Therefore, the career as vlogger has a lot to offer. If you want to know more about the career as vlogger, how to become a vlogger, so on and so forth then continue reading the article. Students can visit Jamia Millia Islamia, Asian College of Journalism, Indian Institute of Mass Communication to pursue journalism degrees.

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    Editor

    Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

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    Content Writer

    Content writing is meant to speak directly with a particular audience, such as customers, potential customers, investors, employees, or other stakeholders. The main aim of professional content writers is to speak to their targeted audience and if it is not then it is not doing its job. There are numerous kinds of the content present on the website and each is different based on the service or the product it is used for.

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    Reporter

    Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.  

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    Linguist

    Linguistic meaning is related to language or Linguistics which is the study of languages. A career as a linguistic meaning, a profession that is based on the scientific study of language, and it's a very broad field with many specialities. Famous linguists work in academia, researching and teaching different areas of language, such as phonetics (sounds), syntax (word order) and semantics (meaning). 

    Other researchers focus on specialities like computational linguistics, which seeks to better match human and computer language capacities, or applied linguistics, which is concerned with improving language education. Still, others work as language experts for the government, advertising companies, dictionary publishers and various other private enterprises. Some might work from home as freelance linguists. Philologist, phonologist, and dialectician are some of Linguist synonym. Linguists can study French, German, Italian

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    Production Manager

    Production Manager Job Description: A Production Manager is responsible for ensuring smooth running of manufacturing processes in an efficient manner. He or she plans and organises production schedules. The role of Production Manager involves estimation, negotiation on budget and timescales with the clients and managers. 

    Resource Links for Online MBA 

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    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    Quality Controller

    A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product. 

    A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

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    Production Planner

    Individuals who opt for a career as a production planner are professionals who are responsible for ensuring goods manufactured by the employing company are cost-effective and meets quality specifications including ensuring the availability of ready to distribute stock in a timely fashion manner. 

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    Process Development Engineer

    The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.

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    Metrologist

    You might be googling Metrologist meaning. Well, we have an easily understandable Metrologist definition for you. A metrologist is a professional who stays involved in measurement practices in varying industries including electrical and electronics. A Metrologist is responsible for developing processes and systems for measuring objects and repairing electrical instruments. He or she also involved in writing specifications of experimental electronic units. 

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    Structural Engineer

    A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

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    Process Engineer

    As the name suggests, a Process Engineer stays involved in designing, overseeing, assessing and implementing processes to make products and provide services efficiently. Process Engineers are responsible for creating systems to enhance productivity and cut costs. 

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    Information Security Manager

    Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

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    Computer Programmer

    Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

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    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    ITSM Manager

    ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks. 

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    .NET Developer

    .NET Developer Job Description: A .NET Developer is a professional responsible for producing code using .NET languages. He or she is a software developer who uses the .NET technologies platform to create various applications. Dot NET Developer job comes with the responsibility of  creating, designing and developing applications using .NET languages such as VB and C#. 

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    Corporate Executive

    Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

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    DevOps Architect

    A DevOps Architect is responsible for defining a systematic solution that fits the best across technical, operational and and management standards. He or she generates an organised solution by examining a large system environment and selects appropriate application frameworks in order to deal with the system’s difficulties. 

    2 Jobs Available
    Cloud Solution Architect

    Individuals who are interested in working as a Cloud Administration should have the necessary technical skills to handle various tasks related to computing. These include the design and implementation of cloud computing services, as well as the maintenance of their own. Aside from being able to program multiple programming languages, such as Ruby, Python, and Java, individuals also need a degree in computer science.

    2 Jobs Available
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