Magnetism Question 102
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 500°C, then
[MNR 1994]
Options:
A) The time period increases
B) The time period remains unchanged
C) The time period increases
D) The needle stops vibrating
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Answer:
Correct Answer: C
Solution:
$ T\propto \frac{1}{\sqrt{M}} $ . Since magnetic moment decreases with increase in temperature, hence time period T increases.
BETA
