Magnetism Question 126
Question: The period of oscillations of a magnet is 2 sec. When it is remagnetised so that the pole strength is 4 times its period will be
[Kerala PMT 2002]
Options:
A) 4 sec
B) 2 sec
C) 1 sec
D) 1/2 sec
Show Answer
Answer:
Correct Answer: C
Solution:
$ T\propto \frac{1}{\sqrt{M}}\Rightarrow T\propto \frac{1}{\sqrt{m}} $ ; If $ m\to 4 $ times. $ T\to \frac{1}{2} $ times i.e. $ {{T}^{’}}=\frac{T}{2}=\frac{2}{2}=1\sec $
BETA
