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 by ${700}^o$C, then

• A. time period decreases
• B. time period increases
• C. time period remains unchanged
• D. the needle stops vibrating

Answer 1

The correct option is D the needle stops vibrating

On increasing the temperature by ${700}^{o}C$, the magnetic needle is demagnetised.

Therefore, the needle stops vibrating.