Magnetism and Matter Easy Questions and Answers

Magnetism and Matter

A diamagnetic material in a magnetic field moves

A diamagnetic material in a magnetic field moves from stronger to the weaker parts of the field.

Correct Option: B

A diamagnetic material in a magnetic field moves from stronger to the weaker parts of the field.

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It :

Since magnetic field is in vertical direction and needle is free to totate in horizontal plane only so magnetic force cannot rotate the needle in horizontal plane so needle can stay in any position.

Correct Option: B

Since magnetic field is in vertical direction and needle is free to totate in horizontal plane only so magnetic force cannot rotate the needle in horizontal plane so needle can stay in any position.

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

Time period of a vibration magnetometer,

Correct Option: D

Time period of a vibration magnetometer,

Two magnets of magnetic moments M and 2M are placed in a vibration magnetometer, with the identical poles in the same direction. The time period of vibration is T₁. If the magnets are placed with opposite poles together and vibrate with time period T₂, then

Obviously, T₂ > T₁

Correct Option: C

Obviously, T₂ > T₁

For protecting a sensitive equipment from the external electric arc, it should be

The iron can produces a magnetic screening for the equipment as lines of magnetic force can not enter iron enclosure.

Correct Option: B

The iron can produces a magnetic screening for the equipment as lines of magnetic force can not enter iron enclosure.