Magnetism and Matter Test

Result

Magnetism and Matter Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

An iron rod of volume 10^–4 m³ and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is

A
10 Am²

B
15 Am²

C
20 Am²

D
25 Am²

Solution
Question 2
4 / -1

A bar magnet has coercivity 4 × 10³ Am^–1. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

A
2 A

B
4 A

C
6 A

D
8 A

Solution
Question 3
4 / -1

A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 180° to deflect the magnet by 30° from magnetic meridian. When this magnet is replaced by another magnet, the upper end of wire is rotated through 270° to deflect the magnet 30° from magnetic meridian. The ratio of magnetic moments of magnets is

A
1 : 5

B
1 : 8

C
5 : 8

D
8 : 5

Solution
Question 4
4 / -1

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is

A
0°

B
30°

C
45°

D
90°

Solution
Question 5
4 / -1

The unit for molar susceptibility is

A
m³

B
kg–m^–3

C
kg^–1 m³

D
No units

Solution
Question 6
4 / -1

A solenoid has core of a material with relative permeability 500 and its windings carry a current of 1 A. The number of turns of the solenoid is 500 per metre. The magnetization of the material is nearly

A
2.5 × 10³ Am^–1

B
2.5 × 10⁵ Am^–1

C
2.0 × 10³ Am^–1

D
2.0 × 10⁵ Am^–1

Solution
Question 7
4 / -1

For substances hysteresis (B–H) curves are given as shown in figure. For making temporary magnet which of the following is best

A

B

C

D
Question 8
4 / -1

A curve between magnetic moment and temperature of magnet is

A

B

C

D
Question 9
4 / -1

The variation of magnetic susceptibility ( χ ) with temperature for a diamagnetic substance is best represented by

A

B

C

D
Question 10
4 / -1

The variation of magnetic susceptibility ( χ ) with magnetizing field for a paramagnetic substance is

A

B

C

D