Magnetism and Matter Test

Result

Magnetism and Matter Test - 13

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Weekly Quiz Competition

Question 1
4 / -1

An electron of charge e moves in a circular orbit of radius r around the nucleus at a frequency v. The magnetic moment associated with the orbital motion of the electron is

A

B

C

D

Solution
Question 2
4 / -1

A bar magnet when placed at an angle of 30° to the direction of magnetic field induction of 5 × 10^-2 T, experiences a moment of couple 25 × 10 ^-6 Nm. If the length of the magnet is 5 cm, then its pole strength is

A
2 × 10^-2 Am

B
5 × 10^-2 Am

C
2 Am

D
5 Am

Solution
Question 3
4 / -1

A magnet of magnetic moment 20 CGS units is freely suspended in a uniform magnetic field of intensity 0.3 CGS units. The amount of work done in deflecting it by an angle of 30° in CGS units is

A
6

B

C

D
3

Solution
Question 4
4 / -1

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

A
potential varies as

B
potential is zero at all points on the right bisector

C
field varies as r²

D
field is perpendicular to the axis of dipole

Solution
Question 5
4 / -1

The magnetic lines of force inside a bar magnet

A
are from North-pole to South-pole of the magnet

B
do not exist

C
depend upon the area of cross-section of the bar magnet

D
are from South-pole to North-pole of the magnet
Question 6
4 / -1

The effect due to uniform magnetic field on a freely suspended magnetic needle is as follows

A
both torque and net force are present

B
torque is present but no net force

C
both torque and net force are absent

D
net force is present but not torque
Question 7
4 / -1

The intensity of magnetic field due to an isolated pole of strength m at a point distant r from it will be

A

B

C

D

Solution
Question 8
4 / -1

If the B–H curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

A
Both P and Q are suitable for making permanent magnet

B
P is suitable for making permanent magnet and Q for making electromagnet

C
P is suitable for making electromagnet and Q is suitable for permanent magnet

D
Both P and Q are suitable for making electromagnets
Question 9
4 / -1

Needles N₁ , N₂ and N₃ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

A
attract N₁ and N₂ strongly but repel N₃

B
attract N₁ strongly, N₂ weakly and repel N₃ weakly

C
attract N₁, strongly, but repel N₂ and N₃ weakly

D
attract all three of them
Question 10
4 / -1

The magnetic needle has magnetic moment 8.7 × 10^-2 Am² and moment of inertia 11.5 × 10^-6 kg m². It performs 10 complete oscillations in 6.70 s, what is the magnitude of the magnetic field?

A
0.012 T

B
0.120 T

C
1.200 T

D
2.10 T

Solution