Magnetism Question 221
Question: If a bar magnet of pole strength m and magnetic moment M is cut perpendicular to its axis in two equal halves then its new pole strength m’ and magnetic moment M’ are respectively
Options:
A) $ m’=m $ and $ M’=M $
B) $ m’=m $ and $ M’=\frac{M}{2} $
C) $ m’=\frac{m}{2} $ and $ M’=2M $
D) $ m’=2m $ and $ M’=\frac{M}{2} $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] When a bar magnet cut perpendicular to its axis into two equal parts then m’ = m and length $ \ell ‘=\frac{\ell }{2} $
$ \
Therefore ,,,{{M}^{’}}=m{{\ell }^{’}}=m\frac{\ell }{2}=\frac{M}{2} $
BETA
