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NCERT Exemplar Class 12 Physics solutions chapter 5 describes how the phenomena of magnetism is universal. Be it vast, distant galaxies, tiny seemingly insignificant atoms, or men and animals, all are permeated with magnetic fields from various sources. NCERT Exemplar solutions For Class 10 Physics chapter 5 answers questions like - Why does the earth's magnetic field vary from point to point in space? What is the magnetic moment associated with a solenoid? Class 12 NCERT Exemplar Physics chapter 5 solutions also explains how magnetism helps to understand the characteristics and properties of matter, the role of the forces existing between the particles within the substance in determining how the substance behaves when placed in a magnetic field, and classifying the substance based on the kind of response recorded under the influence of the magnetic field.
Also check - NCERT Solutions for Class 12 Physics
Question:1
A toroid of n turns, mean radius R and cross-sectional radius a carries current I. It is placed on a horizontal table taken as x-y plane. Its magnetic moment m
A. is non-zero and points in the z-direction by symmetry.
B. points along the axis of the toroid .
C. is zero, otherwise, there would be a field falling as at large distances outside the toroid.
D. is pointing radially outwards.
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Answer:
The answer is the option (c)Question:2
The magnetic field of Earth can be modelled by that of a point dipole placed at the center of the Earth. The dipole axis makes an angle of with the axis of Earth. At Mumbai, declination is nearly zero.
Then,
A. the declination varies between W to
E.
B. the least declination is°.
C. the plane defined by dipole axis and Earth axis passes through Greenwich.
D. declination averaged over Earth must always be negative.
Answer:
The answer is the option (a) Earth’s magnetic field is similar to a magnetic dipole and we can simulate the nature of Earth’s magnetic field by assuming a dipole at the center of Earth. The axis of the dipole is at an angle ofQuestion:3
In a permanent magnet at room temperature
A. magnetic moment of each molecule is zero.
B. the individual molecules have a non-zero magnetic moment which is all perfectly aligned.
C. domains are partially aligned.
D. domains are all perfectly aligned
Answer:
The answer is the option (d)Question:4
Consider the two idealized systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L >> R, the radius of the cross-section.
In (i) E is ideally treated as a constant between plates and zero outside.
In (ii) the magnetic field is constant inside the solenoid and zero outside.
These idealized assumptions, however, contradict fundamental laws as below:
A. case (i) contradicts Gauss’s Law for electrostatic fields.
B. case (ii) contradicts Gauss’s Law for magnetic fields.
C. case (i) agrees with
D. case (ii) contradicts
Answer:
The answer is the option (b)Question:5
Answer:
The answer is the option (b)Question:6
S is the surface of a lump of magnetic material.
A. Lines of B are necessarily continuous across S.
B. Some lines of B must be discontinuous across S.
C. Lines of H are necessarily continuous across S.
D. Lines of H cannot all be continuous across S.
Answer:
The correct answer are the options (a, d)Question:7
The primary origin(s) of magnetism lies in
A. atomic currents.
B. Pauli exclusion principle.
C. polar nature of molecules.
D. intrinsic spin of the electron.
Answer:
The correct answer are the options (a, d)Question:8
A long solenoid has 1000 turns per meter and carries a current of 1 A. It has a soft iron core of . The core is heated beyond the Curie temperature,
.
A. The H field in the solenoid is (nearly) unchanged, but the B field decreases drastically.
B. The H and B fields in the solenoid are nearly unchanged.
C. The magnetization in the core reverses direction.
D. The magnetization in the core diminishes by a factor of about 108
Answer:
The correct answer are the options (a, d)Question:9
The essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to
A. electrostatic field lines can end on charges and conductors have free charges.
B. lines of B can also end, but conductors cannot end them.
C. lines of B cannot end on any material, and perfect shielding is not possible.
D. shells of high permeability materials can be used to divert lines of B from the interior region.
Answer:
The correct answer is the options (a, c, d)Question:10
Let the magnetic field on Earth be modelled by that of a point magnetic dipole at the center of Earth. The angle of dip at a point on the geographical equator
A. is always zero.
B. can be zero at specific points.
C. can be positive or negative.
D. is bounded.
Answer:
The correct answer are the options (b,c,d)Question:11
Answer:
Magnetic moment of electron and proton are:Question:12
Answer:
Question:14
Answer:
Diamagnetism occurs due to electron’s motion in its orbit and the external magnetic field being opposite to each other, making the net magnetism zero. Temperature does not impact the susceptibility of diamagnetism.Question:15
Answer:
Both liquid nitrogen and the superconducting material are diamagnetic in nature. This does not change even when the superconducting material is dipped into liquid nitrogen. In presence of an external magnetic field, superconducting material will be repelled opposite to the direction of the magnetic field.
Question:16
Answer:
Question:19
Answer:
Time period in this type of S.H.M isQuestion:20
Answer:
Consider a magnetic field line going through the bar magnet. We know that it must be a closed-loop.Question:21
Answer:
Assume the x-z plane (shown below). All points from P to Q lie on the axial line NS placed at the origin.Question:22
Answer:
Question:23
Assume the dipole model for earth’s magnetic field B which is given by BV = vertical component of magnetic field
BH = Horizontal component of magnetic field– latitude as measured from magnetic equator.
Find loci of points for which (i) B is minimum; (ii) dip angle is zero; and (iii) dip angle is
Answer:
(c)
Angle of dip
Thus, is the locus.
Question:25
Answer:
ForIn a nutshell, NCERT Exemplar Class 12 Physics solutions chapter 5 explores the laws and derivations concerning magnetism and matter and earths magnetic field. NCERT Exemplar Class 12 Physics solutions chapter 5 pdf download is available for students. The NCERT solutions provided on this page will help understand all the relevant and vital concepts comprehensively and also aid in preparing for the 12 boards and competitive exams.
.Understanding magnetism is required to answer questions like- Why are some materials magnetic and others not? And why do several substances become magnetised by a field, whereas others remain unaffected? Magnetic materials act as the protagonist in industrial success and technological growth. They have a wide range of uses in the generation of power, transmission and communication, analogue and electronic devices such as clocks or digital wristwatches, scientific and medical equipment, sensors, therapy and delivery. NCERT Exemplar Class 12 Physics chapter 5 solutions discusses the usage of magnets and magnetism
Also read NCERT Solution subject wise
Must read NCERT Notes subject wise
As per latest 2024 syllabus. Maths formulas, equations, & theorems of class 11 & 12th chapters
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The NCERT exemplar Class 12 Physics solutions chapter 5 provided by us will have all the 25 questions of the main exercise.
These questions are solved in the most simple and explanative way so that one can grasp the topic. This will help in understanding the basics and how to solve questions in exams.
This chapter covers various important topics like properties of bar magnet, diamagnetism, ferromagnetism and paramagnetism and earths magnetism etc. These topics are highly crucial from both boards and entrance exam POV.
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hello mahima,
If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
hope this helps.
Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.
Thank you and wishing you all the best for your bright future.
Hello student,
If you are planning to appear again for class 12th board exam with PCMB as a private candidate here is the right information you need:
Remember
, these are tentative dates based on last year. Keep an eye on the CBSE website ( https://www.cbse.gov.in/ ) for the accurate and official announcement.
I hope this answer helps you. If you have more queries then feel free to share your questions with us, we will be happy to help you.
Good luck with your studies!
Hello Aspirant , Hope your doing great . As per your query , your eligible for JEE mains in the year of 2025 , Every candidate can appear for the JEE Main exam 6 times over three consecutive years . The JEE Main exam is held two times every year, in January and April.
Hi there,
Hope you are doing fine
Yes you are certainly eligible for giving the jee exam in the year 2025. You must pass the maths exam with at least 75% criteria as required by jee and provide the marksheet and the passing certificate while registering for the exam.
Pursuing maths as an additional subject while taking biology as your main subject does not offer any hindrance in you appearing for the jee examination. It is indeed an privilege to pursue both maths and biology as the subjects and prepare for the same.
There will be no issue in filling the form while registering for the exam as it will only require your basic details and marksheet which you can provide by attaching the marksheet of maths also. Also, a detailed roadmap is also available on the official websites on how to fill the registration form. So you can fill the form easily.
Hope this resolves your query.
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