Magnetism and Matter Test

Result

Magnetism and Matter Test - 45

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Weekly Quiz Competition

Question 1
4 / -1

A magnetized wire of moment M is bent into an arc of a circle subtending an angle of 60° at the centre; then the new magnetic moment is

A
(2M / π)

B
(M / π)

C

D
(3M / π)

Solution
Question 2
4 / -1

A tangent galvanometer shows a deflection 45° when 10 mA current passes through it. If the horizontal component of the earth\'s field is 3.6 × 10^–5 T and radius of the coil is 10 cm. The number of turns in the coil is

A
5700 turns

B
57 turns

C
570 turns

D
5.7 turns

Solution
Question 3
4 / -1

A magnet is parallel to a uniform magnetic field. If it is rotated by 60°, the work done is 0.8 J. How much work is done in moving it 30° further

A
0.8 × 10⁷ erg

B
0.4 J

C
8 J

D
0.8 erg

Solution
Question 4
4 / -1

Susceptibility of Mg at 300 K is 1.2 × 10^–5. The temperature at which susceptibility will be 1.8 × 10^–5 is

A
450 K

B
200 K

C
375 K

D
None of these

Solution
Question 5
4 / -1

Three identical bar magnets each of magnetic moment M are placed in the form of an equilateral triangle as shown. The net magnetic moment of the system is

A
Zero

B
2 M

C

D

Solution
Question 6
4 / -1

A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?

A
Yes

B
No

C
May be or may not be move

D
Nothing can be said

Solution
Question 7
4 / -1

The magnet of vibration magnetometer is heated so as to reduce its magnetic moment by 36%. By doing this the periodic time of the magnetometer will

A
Increases by 36%

B
Increases by 25%

C
Decreases by 25%

D
Decreases by 345

Solution
Question 8
4 / -1

The ratio of magnetic moments of two bar magnets is 13 : 5. These magnets held together in a vibration magnetometer oscillate with 15 oscillations per minute in earth’s magnetic field with like poles together. What will be the frequency of oscillations of system if unlike poles are together

A
10 oscillations / min

B
15 oscillations / min

C
12 oscillations / min

D

Solution
Question 9
4 / -1

A magnet is suspended horizontally in the earth’s magnet field. When it is displaced and then released it oscillates in a horizontal plane with a period T. If a piece of wood of the same moment of inertia (about the axis of rotation) as the magnet is attached to the magnet, what would be the new period of oscillation of the system

A

B

C

D

Solution
Question 10
4 / -1

Two short magnets of magnetic moment 1000 Am² are placed as shown at the corners of a square of side 10 cm. The net magnetic induction at P is

A
0.1 T

B
0.2 T

C
0.3 T

D
0.4 T

Solution