A) \[\frac{1}{2\sqrt{2}}\]
B) \[1\]
C) \[\frac{1}{\sqrt{2}}\]
D) \[\sqrt{2}\]
Correct Answer: D
Solution :
When magnet is cut axially, new magnetic moment of each part \[M=\left( \frac{m}{2} \right)l=\frac{{{M}_{1}}}{2}\] On placing both the parts perpendicularly. \[{{M}_{2}}=\sqrt{{{(M)}^{2}}+{{(M)}^{2}}}=\frac{{{M}_{1}}}{\sqrt{2}}\] Therefore, \[\frac{{{M}_{1}}}{{{M}_{2}}}=\sqrt{2}\]
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