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JEE • PHYSICS • MAGNETISM AND MATTER

Magnetism and matter practice · Medium

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 323 questions

1 Medium

1 of 323

Remembering +4 | -1

Curie temperature is the one above which

View answer and explanation

Correct option: D

Ferromagnetic changes to paramagnetic

Option D (Ferromagnetic changes to paramagnetic) is correct because the Curie temperature is the temperature above which a ferromagnetic material loses its ferromagnetic properties and becomes paramagnetic.

2 Medium

2 of 323

Application +4 | -1

A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is

View answer and explanation

Correct option: C

Option C (2) is correct because the time period is affected by the change in the magnetic moment when one magnet is removed.

3 Medium

3 of 323

Understanding +4 | -1

The relative permeability of a substance

X

is slightly less than unity and that of substance

Y

is slightly more than unity, then

View answer and explanation

Correct option: D

X

is diamagnetic and

Y

is paramagnetic

Option D is correct because diamagnetic substances have a relative permeability slightly less than 1, while paramagnetic substances have a relative permeability slightly more than 1.

4 Medium

4 of 323

Understanding +4 | -1

A bar magnet is equivalent to

View answer and explanation

Correct option: C

Solenoid carrying current

Option C (Solenoid carrying current) is correct because a solenoid carrying current produces a magnetic field similar to that of a bar magnet.

5 Medium

5 of 323

Understanding +4 | -1

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

and

\mu_{\mathrm{f}}

respectively, then :-

View answer and explanation

Correct option: D

\mu_d=0

and

\mu_p \neq 0

Option D (

\mu_d=0

and

\mu_p \neq 0

) is correct because diamagnetic materials have no permanent dipole moment, while paramagnetic materials do.

6 Medium

6 of 323

Remembering +4 | -1

Which of the following is most suitable for the core of electromagnets

View answer and explanation

Correct option: A

Soft iron

Option A (Soft iron) is correct because soft iron is a highly ferromagnetic material with high permeability and low retentivity, making it ideal for electromagnet cores.

7 Medium

7 of 323

Remembering +4 | -1

Electromagnets are made of soft iron because soft iron has

View answer and explanation

Correct option: C

High permeability and low retentivity

Option C (High permeability and low retentivity) is correct because soft iron is easily magnetized (high permeability) and demagnetized (low retentivity), making it suitable for electromagnets.

8 Medium

8 of 323

Understanding +4 | -1

Let

\mathrm{m}

and

\mathrm{r}

are the dipole moment and radius of earth respectively. Then, the earth's magnetic field at the equator is

View answer and explanation

Correct option: A

\frac{\mu_0}{4 \pi} \frac{\mathrm{m}}{\mathrm{r}^3}

Option A is correct because the magnetic field at the equator due to the Earth's dipole moment is given by the formula B = (

\mu_0

\pi

) (m/r³).

9 Medium

9 of 323

Remembering +4 | -1

The magnetic susceptibility is negative for:

View answer and explanation

Correct option: A

Diamagnetic material only

Option A (Diamagnetic material only) is correct because diamagnetic materials have a negative magnetic susceptibility, indicating they are weakly repelled by magnetic fields.

10 Medium

10 of 323

Remembering +4 | -1

Ferromagnetism in a material arises due to

View answer and explanation

Correct option: A

Spin-orbit interaction of electrons

Option A (Spin-orbit interaction of electrons) is correct because ferromagnetism arises from the alignment of electron spins due to spin-orbit interaction and exchange interactions.

11 Medium

11 of 323

Understanding +4 | -1

Which of the following statements is true for the three types of magnetism - para, dia and fero

View answer and explanation

Correct option: B

Diamagnetism is generally weakest of the three, and is associated with negative susceptibility

Option B is correct because Diamagnetism is the weakest form of magnetism and is associated with negative susceptibility.

12 Medium

12 of 323

Understanding +4 | -1

Assertion : Magnetic lines forms closed loops in nature.

Reason : Mono-magnetic pole does not exist in nature.

View answer and explanation

Correct option: A

If both Assertion & reason are True & the reason is a correct explanation of the assertion

Option A is correct because magnetic field lines always form closed loops, and this is a direct consequence of the non-existence of magnetic monopoles.

13 Medium

13 of 323

Analyzing +4 | -1

Assertion (A): Two short magnets are placed on a cork which floats on water. The magnets are placed such that the axis of one produced bisects the axis of other at right angles. Then the cork has neither translational nor rotational motion.
Reason (R): Net force on the cork is zero.

View answer and explanation

Correct option: A

If both (A) and (R) are true and the (R) is a correct explanation of the (A)

Option A (If both (A) and (R) are true and the (R) is a correct explanation of the (A)) is correct because the cork experiences no net force, resulting in no translational or rotational motion.

14 Medium

14 of 323

Understanding +4 | -1

Assertion (A): A magnet may levitated above a super conducting material.

Reason (R): There is always repulsive force between a diamagnet and a magnet that produced non uniform magnetic field.

View answer and explanation

Correct option: A

If both (A) and (R) are true and the (R) is a correct explanation of the (A)

Option A (If both (A) and (R) are true and the (R) is a correct explanation of the (A)) is correct because a superconductor expels magnetic fields (Meissner effect), creating a repulsive force that can levitate a magnet.

15 Medium

15 of 323

Understanding +4 | -1

As magnetising field on a ferromagnetic material is increased, its permeability

View answer and explanation

Correct option: B

Decreases

Option B (Decreases) is correct because as the magnetizing field increases, the permeability of a ferromagnetic material generally decreases.

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16 Medium

16 of 323

Application +4 | -1

A magnetized wire of magnetic moment '

M

' and length '

l

' is bent in the form of a semicircle of radius '

r

'. The new magnetic moment is.

View answer and explanation

Correct option: B

\frac{{2Mr}}{l}

Option B (

\frac{{2Mr}}{l}

) is correct because the new magnetic moment is calculated based on the geometry of the semicircle and the original magnetic moment.

17 Medium

17 of 323

Understanding +4 | -1

A magnetic needle is kept in a non-uniform magnetic field. It experiences force and torque both due to unequal forces acting on poles.

View answer and explanation

Correct option: C

A force and a torque

Option C (A force and a torque) is correct because a non-uniform magnetic field exerts both a net force and a torque on a magnetic needle.

18 Medium

18 of 323

Remembering +4 | -1

If the magnetic susceptibility of a specimen is small and positive, then the specimen is

View answer and explanation

Correct option: B

Paramagnetic

Option B (Paramagnetic) is correct because paramagnetic materials have a small, positive magnetic susceptibility, indicating a weak attraction to magnetic fields.

19 Medium

19 of 323

Understanding +4 | -1

The materials for the construction of electro magnets should have

View answer and explanation

Correct option: A

high initial permeability

The correct answer is A (high initial permeability) because electromagnets require materials that can be easily magnetized.

20 Medium

20 of 323

Application +4 | -1

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is

View answer and explanation

Correct option: C

Option C (2) is correct because the time period is affected by the change in the magnetic moment when one magnet is removed.

21 Medium

21 of 323

Application +4 | -1

Two magnetic moments

8\,A{m^2}

and

6\,A{m^2}

are joined to form a cross (+), then the magnetic moment of the combination is

\left[ {A{m^2}} \right]

View answer and explanation

Correct option: C

Option C (10) is correct because the magnetic moment of the combination is the vector sum of the individual magnetic moments, which are perpendicular.

22 Medium

22 of 323

Remembering +4 | -1

Water is

View answer and explanation

Correct option: A

Diamagnetic

Option A (Diamagnetic) is correct because water is a diamagnetic substance, meaning it is weakly repelled by magnetic fields.

23 Medium

23 of 323

Application +4 | -1

Relative permeability of iron is 5500, then it magnetic susceptibility will be

View answer and explanation

Correct option: D

5499

Option D (5499) is correct because magnetic susceptibility is calculated as relative permeability minus 1.

24 Medium

24 of 323

Application +4 | -1

The two bar magnets placed together in a vibration magnetometer take 3 seconds for 1 vibration. If one magnet is reversed, the combination takes 4 seconds for 1 vibration. Find the ratio of their magnetic moments.

View answer and explanation

Correct option: D

3.57

Option D (3.57) is correct because it is the calculated ratio of the magnetic moments using the given time periods for vibration magnetometer.

25 Medium

25 of 323

Application +4 | -1

The core of a toroid having 3000 turns has inner and outer radii of

11 \mathrm{~cm}

and

12 \mathrm{~cm}

respectively. The magnetic field in the core for a current of

0.70 \mathrm{~A}

2.5 \mathrm{~T}

. What is the relative permeability of the core?

View answer and explanation

Correct option: A

684.4

Option A (684.4) is correct because it is the relative permeability calculated using the given magnetic field, number of turns, current, and radii of the toroid.

26 Medium

26 of 323

Remembering +4 | -1

The strength of the Earth's magnetic field is :

View answer and explanation

Correct option: D

varying from place to place on the Earth's surface

Option D (varying from place to place on the Earth's surface) is correct because the Earth's magnetic field is generated by complex processes in the core and varies spatially.

27 Medium

27 of 323

Application +4 | -1

A vertical wire in which current is flowing produces a neutral point with the earth's horizontal field at a distance of

5 \mathrm{~cm}

from the wire in air. What is current, if

B_H=0.18 \times 10^{-4} \mathrm{~T}

View answer and explanation

Correct option: A

4.5 A

Option A (4.5 A) is correct because it is the current calculated using the formula relating magnetic field due to a straight wire and the Earth's horizontal magnetic field.

28 Medium

28 of 323

Application +4 | -1

With a standard rectangular bar magnet of length

\left( l \right)

, breadth

(b;\;b < < l)

and magnetic moment

M

, the time period of the magnet in vibration magnetometer is 4 s. If the magnet is cut normal to its length into four equal pieces, the time period (in second) with one of the pieces

View answer and explanation

Correct option: C

Option C (1) is correct because when the magnet is cut into four equal pieces, the magnetic moment and moment of inertia change, affecting the time period of oscillation.

29 Medium

29 of 323

Understanding +4 | -1

Vibration magnetometer works on the
principle of

View answer and explanation

Correct option: A

torque acting on the bar magnet

Option A (torque acting on the bar magnet) is correct because the vibration magnetometer works based on the restoring torque acting on the magnet.

30 Medium

30 of 323

Application +4 | -1

A bar magnet of magnetic moment

{10^4}J/T

is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of

4 \times {10^{ - 5}}T

to a direction

60^\circ

from the field will be

View answer and explanation

Correct option: A

0.2

J

Option A (0.2 J) is correct because the work done is calculated using the formula

W = MB(cos\theta_1 - cos\theta_2)

with the given values.

Revision notes and key takeaways

Review MAGNETISM AND MATTER in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 323 single-correct-answer MCQs on MAGNETISM AND MATTER.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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