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 $700^{\circ}C$, then

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

Answer 1

Answer: (B)

time period increases

Answer 2

On increasing the temperature by $700^{\circ}C$, the magnetic needle is demagnetised. Therefore, the needle stops vibrating.