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A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two at the middle. The magnetic moment and pole strength of each piece will be

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M/2, m/2

M, m/2

M/2, m

M, m

answer is C.

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Detailed Solution

magnetic moment of original magnet = M =2L X m

POLE strength = m

when the magnet is cut into two parts at the middle length of each piece = L

Pole strength will not change pole strength of each new magnet = m

magnetic moment of each new magnet = m x L = M / 2

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