A) M
B) \[\frac{M}{\sqrt{2}}\]
C) \[\frac{M}{2}\]
D) \[2M\]
Correct Answer: B
Solution :
[b] Magnetic moment, \[M=m\ell \] \[\frac{M}{\ell }=m\], where m is the polestrength. Therefore distance between poles \[=\sqrt{{{(\ell /2)}^{2}}+{{(\ell /2)}^{2}}}=\frac{\ell }{2}\] So, \[M'=\frac{m\ell }{\sqrt{2}}=\frac{M}{\sqrt{2}}\]
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