Magnetism and Matter Test

Result

Magnetism and Matter Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be

A

B

C
md

D
md²

Solution
Question 2
4 / -1

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque required to maintain the needle in this position will be

A

B

C

D

Solution
Question 3
4 / -1

A long magnetic neddle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be

A

B

C

D

Solution
Question 4
4 / -1

Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is

A
ml

B
2ml

C
√2 ml

D
1/2 ml

Solution
Question 5
4 / -1

A small bar magnet has a magnetic moment 1.2 A-m². The magnetic field at a distance 0.1 m on its axis will be: (µ₀ = 4 π × 10^–4 T-m/A)

A
1.2 × 10^–4 T

B
2.4 × 10^–4 T

C
2.4 × 10⁴ T

D
1.2 × 10⁴ T

Solution
Question 6
4 / -1

What happens to the force between magnetic poles when their pole strength and the distance between them are both doubled

A
Force increases to two times to previous value

B
No change

C
Force decreases to half the previous value

D
Force increase to four times the previous value

Solution
Question 7
4 / -1

The magnetic potential at a point on the axial line of a bar magnet of dipole moment M is V. What is the magnetic potential due to a bar magnet of dipole moment M/4 at the same point

A
4 V

B
2 V

C

D

Solution
Question 8
4 / -1

A small bar magnet of moment M is placed in a uniform field H . If magnet makes an angle of 30° with field, the torque acting on the magnet is

A
MH

B

C

D

Solution
Question 9
4 / -1

Two small magnets each of magnetic moment 10 A-m² are placed in end-on position 0.1 m apart from their centres. The force acting between them is

A
0.6 × 10⁷ N

B
0.06 × 10⁷N

C
0.6 N

D
0.06 N

Solution
Question 10
4 / -1

Magnetic lines of force

A
Always intersect

B
Are always closed

C
Tend to crowd far away from the poles of magnet

D
Do not pass through vacuum