A) \[\frac{M}{1.4}\]
B) M
C) \[1.4\,M\]
D) \[2.8M\]
Correct Answer: A
Solution :
The magnetic moment of the two parts after breaking are \[\frac{6}{14}M=\frac{3}{7}M\]and \[\frac{8}{14}M=\frac{4}{7}M\] Their vector sum after placing at right angles. \[\sqrt{{{\left( \frac{3}{7}M \right)}^{2}}+{{\left( \frac{4}{7}M \right)}^{2}}}=\frac{5}{7}M=\frac{M}{1.4}\]
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