Question 1: Palette 1/47

NEET 2024 MCQ

The magnetic potential energy, when a magnetic bar of magnetic moment $\vec{m}$ is placed perpendicular to the magnetic field $\vec{B}$ is

A

$-\frac{m B}{2}$

B

Zero

C

$-m B$

D

$m B$

Question 2: Palette 2/47

NEET 2024 MCQ

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and $\varepsilon$ is a small positive number) is

A

$\mu<\mu_0$

B

$0 \leq \mu_r<1$

C

$-1 \leq \chi<0$

D

$1<\mu_r<1+\varepsilon$

Question 3: Palette 3/47

NEET 2024 MCQ

The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, $1.0 \times 10^{-2} \mathrm{~A} \mathrm{~m}^2$ and $\frac{10^{-6}}{\pi^2} \mathrm{~kg} \mathrm{~m}^2$. If it completes 10 oscillations in $10 \mathrm{~s}$, the magnitude of the magnetic field is

A

0.4 T

B

4 T

C

0.4 mT

D

4 mT

Question 4: Palette 4/47

NEET 2024 MCQ

The magnetic moment of an iron bar is $M$. It is now bent in such a way that it forms an arc section of a circle subtending an angle of $60^{\circ}$ at the centre. The magnetic moment of this arc section is

A

$\frac{3 M}{\pi}$

B

$\frac{4 M}{\pi}$

C

$\frac{M}{\pi}$

D

$\frac{2 M}{\pi}$

Question 5: Palette 5/47

NEET 2024 MCQ

In a uniform magnetic field of $0.049 \mathrm{~T}$, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8 \times 10^{-6} \mathrm{~kg} \mathrm{~m}^2$. If the magnitude of magnetic moment of the needle is $x \times 10^{-5} \mathrm{~Am}^2$, then the value of '$x$' is :

A

5$\pi^2$

B

128$\pi^2$

C

50$\pi^2$

D

1280$\pi^2$

Question 6: Palette 6/47

NEET 2024 MCQ

In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:

A

AB and DC

B

BA and CD

C

AB and CD

D

BA and DC

Question 7: Palette 7/47

NEET 2024 MCQ

Match List I with List II

	List I (Material)		List II (Susceptibility ($\chi))
A.	Diamagnetic	I.	$\chi=0$
B.	Ferromagnetic	II.	$0 > \chi \ge -1$
C.	Paramagnetic	III.	$\chi >> 1$
D.	Non-magnetic	IV.	$0 < \chi < \varepsilon$ (a small positive number)

Choose the correct answer from the options given below.

A

A-II, B-III, C-IV, D-I

B

A-II, B-I, C-III, D-IV

C

A-III, B-II, C-I, D-IV

D

A-IV, B-III, C-II, D-I

Question 8: Palette 8/47

NEET 2024 MCQ

A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

A. hold the sheet there if it is magnetic.

B. hold the sheet there if it is non-magnetic.

C. move the sheet away from the pole with uniform velocity if it is conducting.

D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.

Choose the correct statement(s) from the options given below:

A

B and D only

B

A and C only

C

A, C and D only

D

C only

Question 9: Palette 9/47

NEET 2024 MCQ

An iron bar of length $L$ has magnetic moment $M$. It is bent at the middle of its length such that the two arms make an angle $60^{\circ}$ with each other. The magnetic moment of this new magnet is :

A

$M$

B

$\frac{M}{2}$

C

$2 M$

D

$\frac{M}{\sqrt{3}}$

Question 10: Palette 10/47

NEET 2023 MCQ

The variation of susceptibility $(\chi)$ with absolute temperature ( $\mathrm{T}$ ) for a paramagnetic material is represented as :

A

B

C

D

Question 11: Palette 11/47

NEET 2022 MCQ

A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad s^$-$1. If the vertical component of earth's magnetic field at that place is 2 $\times$ 10^$-$5 T and electrical resistance of the coil is 12.56 $\Omega$, then the maximum induced current in the coil will be

A

0.25 A

B

1.5 A

C

1 A

D

2 A

Question 12: Palette 12/47

NEET 2021 MCQ

In the product

$\overrightarrow F = q\left( {\overrightarrow v \times \overrightarrow B } \right)$

$ = q\overrightarrow v \times \left( {B\widehat i + B\widehat j + {B_0}\widehat k} \right)$

For q = 1 and $\overrightarrow v = 2\widehat i + 4\widehat j + 6\widehat k$ and $\overrightarrow F = 4\widehat i - 20\widehat j + 12\widehat k$

What will be the complete expression for $\overrightarrow B $ ?

A

$6\widehat i + 6\widehat j - 8\widehat k$

B

$ - 8\widehat i - 8\widehat j - 6\widehat k$

C

$ - 6\widehat i - 6\widehat j - 8\widehat k$

D

$8\widehat i + 8\widehat j - 6\widehat k$

Question 13: Palette 13/47

NEET 2021 MCQ

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of ,

(i) an equilateral tringle of side 'a'

(ii) A square of side 'a'

The magnetic dipole moments of the coil in each case respectively are :

A

4Ia² and 3Ia²

B

$\sqrt 3 $ Ia² and 3I a²

C

3Ia² and Ia²

D

3Ia² and 4Ia²

Question 14: Palette 14/47

NEET 2020 MCQ

An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m^-1. The permeability of the material of the rod is :
$\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}Tm{A^{ - 1}}} \right)$

A

$8.0 \times {10^{ - 5}}Tm{A^{ - 1}}$

B

$2.4\pi \times {10^{ - 5}}Tm{A^{ - 1}}$

C

$2.4\pi \times {10^{ - 7}}Tm{A^{ - 1}}$

D

$2.4\pi \times {10^{ - 4}}Tm{A^{ - 1}}$

Question 15: Palette 15/47

NEET 2019 MCQ

At a point A on the earth’s surface the angle of dip, $\delta $ = + 25^o. At a point B on the earth's surface the angle of dip, $\delta $ = – 25^o. We can interpret that :

A

A is located in the southern hemisphere and B is located in the northern hemisphere.

B

A is located in the northern hemisphere and B is located in the southern hemisphere.

C

A and B are both located in the southern hemisphere.

D

A and B are both located in the northerm hemisphere.

Question 16: Palette 16/47

NEET 2018 MCQ

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

A

The current source

B

The magnetic field

C

The lattice structure of the material of the rod

D

The induced electric field due to the changing magnetic field

Question 17: Palette 17/47

NEET 2017 MCQ

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $\mu $A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180^o against the torque is

A

4.55 $\mu $J

B

2.3 $\mu $J

C

1.15 $\mu $J

D

9.1 $\mu $J

Question 18: Palette 18/47

NEET 2017 MCQ

If $\theta $₁ and $\theta $₂ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta $ is given by

A

tan²$\theta $ = tan²$\theta $₁ + tan²$\theta $₂

B

cot²$\theta $ = cot²$\theta $₁ $-$cot²$\theta $₂

C

tan²$\theta $ = tan²$\theta $₁ $-$ tan²$\theta $₂

D

cot²$\theta $ = cot²$\theta $₁ + cot²$\theta $₂

Question 19: Palette 19/47

NEET 2016 MCQ

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60^o is W. Now the torque required to keep the magnet in this new position is

A

${W \over {\sqrt 3 }}$

B

$\sqrt 3 W$

C

${{\sqrt 3 W} \over 2}$

D

${{2W} \over {\sqrt 3 }}$

Question 20: Palette 20/47

NEET 2016 MCQ

The magnetic susceptibility is negative for

A

ferromagnetic material only

B

paramagnetic and ferromagnetic materials

C

diamagnetic material only

D

paramagnetic material only

Question 21: Palette 21/47

NEET 2015 MCQ

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 weber/m². The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30^o with the direction of the field, the torque required to keep the coil in stable equilibrium will be

A

0.24 Nm

B

0.12 Nm

C

0.15 Nm

D

0.20 Nm

Question 22: Palette 22/47

NEET 2014 MCQ

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $\overrightarrow m .$ Which configuration has highest net magnetic dipole moment ?

A

(1)

B

(2)

C

(3)

D

(4)

Question 23: Palette 23/47

NEET 2013 MCQ

A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be

A

MB/F

B

BF/M

C

MF/B

D

F/MB

Question 24: Palette 24/47

NEET 2013 MCQ

A current loop in a magnetic field

A

can be in equilibrium in two orientations, both the equilibrium states are unstable.

B

can be in equilibrium in two orientations, one stable while the other is unstable.

C

experiences a torque whether the field is uniform or non uniform in all orientations.

D

can be in equilibrium in one orientation.

Question 25: Palette 25/47

NEET 2013 MCQ

A bar magnet of length $'l'$ and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

A

${2 \over \pi }M$

B

${M \over 2}$

C

M

D

${3 \over \pi }M$

Question 26: Palette 26/47

NEET 2012 MCQ

A magnetic needle suspended parallel to a magnetic field requires $\sqrt 3 J$ of work to turn it through 60^o. The torque needed to maintain the needle in this position will be

A

$2\sqrt 3 J$

B

$3$ $J$

C

$\sqrt 3 \,J$

D

${3 \over 2}\,J$

Question 27: Palette 27/47

NEET 2012 MCQ

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

A

will become rigif showing no movement

B

will stay in any position

C

will stay in north-south direction only

D

will stay in east-west direction only

Question 28: Palette 28/47

NEET 2011 MCQ

A short bar magnet of magnetic moment 0.4 J T^$-$1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

A

0.064 J

B

$-$ 0.064 J

C

zero

D

$-$ 0.082 J

Question 29: Palette 29/47

NEET 2011 MCQ

There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted
(i)  A is feebly repelled
(ii)  B is feebly attracted
(iii)  C is strongly attracted
(iv)  D remains unaffected

Which one of the following is true ?

A

B is of a paramagnetic material

B

C is of a diamagnetic material

C

D is of a ferromagnetic material

D

A is of a non-magnetic material

Question 30: Palette 30/47

NEET 2010 MCQ

Two identical bar magnets are fixed with their centers at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure


The force on the charge Q is

A

zero

B

directed along OP

C

directed along PO

D

directed perpendicular to the plane of paper

Question 31: Palette 31/47

NEET 2010 MCQ

The magnetic moment of a diamagnetic action is

A

much greater than one

B

1

C

between zero and one

D

equal to zero

Question 32: Palette 32/47

NEET 2010 MCQ

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

A

1 s

B

2 s

C

3 s

D

4 s

Question 33: Palette 33/47

NEET 2010 MCQ

Electromagnets are made of soft iron because soft iron has

A

low retentivity and high coercive force

B

high retentivity and high coercive force

C

low retentivity and low coercive force

D

high retentivity and low coercive force

Question 34: Palette 34/47

NEET 2009 MCQ

A bar magnet having a magnetic moment of 2 $ \times $ 10⁴ J T^$-$1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 $ \times $ 10^$-$4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60^o from the field is

A

12 J

B

6 J

C

2 J

D

0.6 J

Question 35: Palette 35/47

NEET 2009 MCQ

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is

A

repelled by the north pole and attracted by the south pole

B

attracted by the north pole and repelled by the south pole

C

attracted by both the poles

D

repelled by both the poles

Question 36: Palette 36/47

NEET 2008 MCQ

Curie temperature above which

A

paramagnetic material becomes ferromagnetic material

B

ferromagnetic material becomes diamagnetic material

C

ferromagnetic material becomes paramagnetic material

D

paramagnetic material becomes diamagnetic material

Question 37: Palette 37/47

NEET 2007 MCQ

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

A

anti ferromagnetism

B

no magnetic property

C

diamagnetism

D

paramagnetism.

Question 38: Palette 38/47

NEET 2007 MCQ

A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment $\mu $ is given by

A

$qv{R^2}$

B

$qv{R^2}/2$

C

qvR

D

qvR/2

Question 39: Palette 39/47

NEET 2006 MCQ

Curie temperature above which

A

paramagnetic material becomes ferromagnetic material

B

ferromagnetic material becomes diamagnetic material

C

ferromagnetic material becomes paramagnetic material

D

paramagnetic material becomes diamagnetic material

Question 40: Palette 40/47

NEET 2005 MCQ

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu $_d, $\mu $_p and $\mu $_f respectively, then

A

${\mu _d} = 0$ and $\mu $_p $ \ne $ 0

B

$\mu $_d $ \ne $ 0 and $\mu $_p = 0

C

$\mu $_p = 0 and $\mu $_f $ \ne $ 0

D

$\mu $_d $ \ne $ 0 and $\mu $_f $ \ne $ 0.

Question 41: Palette 41/47

NEET 2005 MCQ

A coil in the shape of an equilateral triangle of side $l$ is suspended between the pole pieces of a permanent magnet such that $\overrightarrow B $ is in plane of the coil. If due to a current i in the triangle a torque $\tau $ acts on it, the side $l$ of the triangle is

A

${2 \over {\sqrt 3 }}\left( {{\tau \over {Bi}}} \right)$

B

$2{\left( {{\tau \over {\sqrt 3 Bi}}} \right)^{1/2}}$

C

${2 \over {\sqrt 3 }}{\left( {{\tau \over {Bi}}} \right)^{1/2}}$

D

${1 \over {\sqrt 3 }}{\tau \over {Bi}}$

Question 42: Palette 42/47

NEET 2003 MCQ

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $T$ is proportional to

A

$1/T$

B

$T$

C

$1/T$²

D

$T$²

Question 43: Palette 43/47

NEET 2003 MCQ

A diamagnetic material in a magnetic field moves

A

from stronger to the weaker parts of the field

B

from weaker to the stronger parts of the field

C

perpendicular to the field

D

in none of the above directions

Question 44: Palette 44/47

NEET 2003 MCQ

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled?

A

motion remains simple harmonic with time period = $T/2$

B

motion remains S.H.M with time period = 2T

C

motion remains S.H.M with time period = 4T

D

motion remains S.H.M and period remains nearly constant

Question 45: Palette 45/47

NEET 2002 MCQ

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is T₁. Now the polarity of one of the magnet is reversed then time period of oscillation is T₂, then

A

T₁ < T₂

B

T₁ = T₂

C

T₁ > T₂

D

T₂ = $\infty $

Question 46: Palette 46/47

NEET 2001 MCQ

Among which the magnetic susceptibility does not depened on the temperature ?

A

diamagnetism

B

paramagnetism

C

ferromagnetism

D

ferrite.

Question 47: Palette 47/47

NEET 2001 MCQ

Tangent galvanometer is used to measure

A

potential difference

B

current

C

resistance

D

charge