First slide

Magnetic properites of materials.

Question

A magnetic needle suspended by a silk-thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased 1000^oC, then

Easy

A

the time period decreases
B

the time period remains unchanged
C

the time period increases
D

the needle stops vibrating

Solution

The needle will stop vibrating as at this high temperature the needle loses its magnetism.

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