The relation between $B,H{\rm{\;and}}\;I$ in SI unit is

$B = {{\rm{\mu }}_0}\left( {H + I} \right)$

$H = $${{\rm{\mu }}_0}\left( {B + I} \right)$

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NEET • PHYSICS • MAGNETISM AND MATTER

Magnetism and matter practice · Mixed difficulty

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Showing 1-30 of 164 questions

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1 Easy

1 of 164

Analyzing +4 | -1

Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
Reason: Magnetic field produced by current is always non - conservative 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 the work done in moving a unit north pole around a current-carrying wire is non-zero, and this is due to the non-conservative nature of the magnetic field produced by the current.

2 Easy

2 of 164

Application +4 | -1

The magnetic length of a bar magnet is 15 cm then its geometric length is

View answer and explanation

Correct option: A

18 cm

Option A is correct because the geometric length is approximately 6/5 times the magnetic length for a bar magnet, resulting in 18 cm.

3 Easy

3 of 164

Application +4 | -1

If area vector

\vec A = 2\vec i - 3\vec j + 6\vec k\,{m^2}

flux density vector

\vec B = - 3\vec i + \vec j + 2\vec k\,\left( {Wb/{m^2}} \right)

. Then magnetic flux linked with the coil is [Wb]

View answer and explanation

Correct option: B

Option B is correct because the magnetic flux is calculated by taking the dot product of the area vector and the magnetic flux density vector, which results in 3 Wb.

4 Medium

4 of 164

Application +4 | -1

The area of hysteresis loop of a material is equivalent to

250\;joule

. When

10\;kg

material is magnetized by an alternating field of

50\;Hz

then energy lost in one hour will be (density of material is

7.5\;gm/c{m^3}

)

View answer and explanation

Correct option: A

6 \times {10^4}J

Option A is correct. The energy lost per unit volume per cycle is given, and the total energy loss is calculated based on the volume and frequency.

5 Easy

5 of 164

Remembering +4 | -1

A bar magnet of moment

M

is placed in the magnetic field

B

. The torque acting on the magnet is

View answer and explanation

Correct option: A

\mathrm{M} \times \mathrm{B}

Option A (

\mathrm{M} \times \mathrm{B}

) is correct because the torque on a magnet in a magnetic field is given by the cross product of the magnetic moment and the magnetic field.

6 Medium

6 of 164

Analyzing +4 | -1

Assertion(A): Earth's magnetic field inside a closed iron box is less as compared to the out side.

Reason(R): The magnetic permeability of iron is low.

View answer and explanation

Correct option: C

If (A) is true but the (R) is false

Option C (If (A) is true but the (R) is false) is correct because the magnetic field inside a closed iron box is less due to the high permeability of iron, not low permeability.

7 Medium

7 of 164

Application +4 | -1

Force between two identical short bar magnets whose centers are

r

metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3

r

and the axis are rearranged perpendicularly, the force between them would become

View answer and explanation

Correct option: C

0.1 N

Option C (0.1 N) is correct because the force between the magnets changes with distance and orientation.

8 Medium

8 of 164

Understanding +4 | -1

The vertical component of earth’s magnetic field is zero or The earth’s magnetic field always has a vertical component except at the

View answer and explanation

Correct option: D

Magnetic equator

Option D (Magnetic equator) is correct because the vertical component of the Earth's magnetic field is zero at the magnetic equator.

9 Medium

9 of 164

Remembering +4 | -1

The magnetising field required to be applied in opposite direction to reduce residual magnetism to zero is called

View answer and explanation

Correct option: A

Coercivity

Option A (Coercivity) is correct because coercivity is the measure of the magnetic field required to reduce the residual magnetism of a material to zero.

10 Medium

10 of 164

Understanding +4 | -1

At the magnetic poles of the earth, a compass needle will be

View answer and explanation

Correct option: B

Bent slightly

Option A (Vertical) is correct because at the magnetic poles, the Earth's magnetic field lines are nearly vertical, causing the compass needle to point almost vertically downwards or upwards.

11 Medium

11 of 164

Understanding +4 | -1

At a point on the right bisector of a magnetic dipole magnetic

View answer and explanation

Correct option: A

Potential varies as

\frac{1}{{{r^2}}}

Option B is correct. The magnetic potential is zero at all points on the right bisector of a magnetic dipole.

12 Medium

12 of 164

Understanding +4 | -1

A dip needle which is free to move in a vertical plane perpendicular to magnetic meridian will remain

View answer and explanation

Correct option: B

Vertical

Option B (Vertical) is correct because a dip needle free to move in a vertical plane perpendicular to the magnetic meridian will align itself with the vertical component of the Earth's magnetic field.

13 Medium

13 of 164

Remembering +4 | -1

The ultimate individual unit of magnetism is any magnet is called

View answer and explanation

Correct option: C

Dipole

Option C is correct. The ultimate individual unit of magnetism is a dipole, as single magnetic poles (monopoles) have not been observed.

14 Easy

14 of 164

Application +4 | -1

When two magnetic moments are compared using equal distance method the deflections produced are

45^\circ

and

30^\circ

. If the length of magnets are in the ratio

1\;:2

, the ratio of their pole strength is

View answer and explanation

Correct option: D

2\sqrt 3 \;:1

Option D (

2\sqrt 3 \;:1

) is correct because it is derived from the tangent law and the given ratio of lengths.

15 Medium

15 of 164

Understanding +4 | -1

A magnetic needle is placed with its north pole
facing north in north south direction. In its
map of magnetic field the null point will be

View answer and explanation

Correct option: A

on its equatorial line

Option A (on its equatorial line) is correct because when a magnetic needle is aligned with the Earth's field, the null points are on the equatorial line.

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16 Medium

16 of 164

Application +4 | -1

If two identical bar magnets, each of length

l,

pole strength

m

and magnet moment

M,

are placed perpendicular to each other with their unlike poles in contact, the magnetic moment of the combination is

View answer and explanation

Correct option: B

lm\left( {\sqrt 2 } \right)

Option B (

lm\left( {\sqrt 2 } \right)

) is correct because the magnetic moments add vectorially, resulting in a net magnetic moment of

\sqrt{M^2 + M^2} = M\sqrt{2} = lm\sqrt{2}

17 Medium

17 of 164

Understanding +4 | -1

A magnet of magnetic moment

M

is freely suspended in a uniform magnetic field strength B. The work done is deflecting the magnet through an angle

\theta

is given by

View answer and explanation

Correct option: D

\mathrm{MB}(1-\cos \theta)

Option D is correct because the work done in deflecting a magnet in a magnetic field is given by MB(1-cosθ), which represents the change in potential energy.

18 Medium

18 of 164

Remembering +4 | -1

Substances in which the magnetic moment of a single atom is not zero, is known as

View answer and explanation

Correct option: C

Paramagnetism

Option C (Paramagnetism) is correct because paramagnetic substances have atoms with non-zero magnetic moments that align weakly with an external field.

19 Medium

19 of 164

Application +4 | -1

A bar magnet of magnetic moment 3.0 A-

{m^2}

is placed in a uniform magnetic induction field of

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

. If each pole of the magnet experiences a force of

6 \times {10^{ - 4}}N

, the length of the magnet is

View answer and explanation

Correct option: D

0.1

m

Option D is correct because the length of the magnet is calculated using the formula relating force, magnetic moment, and magnetic field, resulting in 0.1 m.

20 Medium

20 of 164

Understanding +4 | -1

A bar magnet is suspended from the middle
point in a uniform magnetic field. The couple
acting on the bar magnet is minimum when the
magnet is

View answer and explanation

Correct option: A

parallel to the field

Option A (parallel to the field) is correct because the torque on a magnet is minimum when it's aligned with the magnetic field.

21 Medium

21 of 164

Understanding +4 | -1

The intensity of magnetic field is

H

and moment of magnet is

M

. The maximum potential energy is

View answer and explanation

Correct option: A

MH

Option A is correct because the maximum potential energy of a magnet in a magnetic field is given by MH, occurring when the magnet is anti-aligned with the field.

22 Medium

22 of 164

Remembering +4 | -1

The relation between

B,H\mathrm{\;and}\;I

in SI unit is

View answer and explanation

Correct option: A

B = {\mathrm{\mu }_0}\left( {H + I} \right)

Option A (

B = {\mathrm{\mu }_0}\left( {H + I} \right)

) is correct because it represents the relationship between magnetic induction (B), magnetizing field (H), and magnetization (I) in SI units.

23 Medium

23 of 164

Application +4 | -1

A magnet is parallel to a uniform magnetic field. If it is rotated by

60^\circ

, the work done is 0.8joules. How much additional work is done in moving it

30^\circ

further

View answer and explanation

Correct option: A

0.8 J

Option A is correct. The additional work done is the same as the initial work done (0.8 J) because the change in potential energy is the same for both rotations.

24 Medium

24 of 164

Understanding +4 | -1

All atoms of a magnetic substance have a
resultant magnetic moment even in absence of
external magnetic field. The substance is

View answer and explanation

Correct option: A

ferromagnetic

Option A (ferromagnetic) is correct because ferromagnetic substances retain a resultant magnetic moment even in the absence of an external magnetic field.

25 Medium

25 of 164

Remembering +4 | -1

Which of the following represents correct formula for magnetic flux?

View answer and explanation

Correct option: C

d \phi=\vec{B} \cdot \vec{d} s

Option C (

d \phi=\vec{B} \cdot \vec{d} s

) is correct because it represents the correct formula for magnetic flux as the dot product of the magnetic field vector and the area vector.

26 Easy

26 of 164

Remembering +4 | -1

The SI unit of Magnetic Permiability is:

View answer and explanation

Correct option: C

\mathrm{Hm}^{-1}

Option C (

\mathrm{Hm}^{-1}

) is correct because magnetic permeability is measured in Henry per meter, which is the SI unit.

27 Medium

27 of 164

Understanding +4 | -1

A bar magnet is equivalent to

View answer and explanation

Correct option: C

Solenoid carrying current

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

28 Medium

28 of 164

Understanding +4 | -1

The time period of a freely suspended magnet does not depend upon

View answer and explanation

Correct option: D

Length of the suspension

Option D is correct because the time period of a freely suspended magnet depends on its magnetic moment, moment of inertia, and the Earth's magnetic field, but not the length of the suspension.

29 Medium

29 of 164

Understanding +4 | -1

There is no couple acting when two bar
magnets are placed coaxially separated by a
distance because

View answer and explanation

Correct option: D

the forces act along the same line

Option D is correct because when two bar magnets are placed coaxially, the forces between their poles act along the same line, resulting in no net torque.

30 Hard

30 of 164

Understanding +4 | -1

Given below are three statements.

Statement-A : Every magnetic configuration
must have a north and a south
pole.

Statement-B : Net magnetic flux through any
closed surface is zero, but net
electric flux may not be zero.

Statement-C : Materials showing Meissner
effect have zero magnetic
susceptibility.

In light of the above statements, choose the
correct answer from the options given below.

View answer and explanation

Correct option: D

Only B is correct

Option D is correct. Only Statement-B is correct as magnetic monopoles do not exist, and Meissner effect materials have susceptibility of -1.

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Key Takeaways

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