If the original dipole moment of a bar magnet is $M$, what will be the dipole moment of each piece after cutting it along a transverse axis?
A$M$
B$2M$
C$\frac{M}{2}$
D$0$
Answer & Solution
Correct answer: C. $\frac{M}{2}$
The notes state directly that after a transverse cut, the dipole moment reduces to half. Therefore, if the original moment is $M$, each piece has dipole moment $\frac{M}{2}$.
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