One student cuts a magnet of magnetic moment \( M \), into two identical parts perpendicular to its length. The magnetic moment of each part will be
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → \( M/2 \)
The magnetic moment of a bar magnet is the pole strength times the magnetic length:
\( M = m \times 2l \)
A cut perpendicular to the length gives two shorter magnets. Each piece has the same pole strength \( m \), but its length is halved.
\( \displaystyle M' = m \times \frac{2l}{2} = \frac{M}{2} \)