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 \[M'=\frac{M}{2}\]
Correct Answer: B
Solution :
[b] When a bar magnet cut perpendicular to its axis into two equal parts then m' = m and length \[\ell '=\frac{\ell }{2}\] \[\therefore \,\,\,{{M}^{'}}=m{{\ell }^{'}}=m\frac{\ell }{2}=\frac{M}{2}\]
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