Q.

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

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a

M2,m2

b

M,m2

c

M2,m

d

M, m

answer is C.

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Detailed Solution

Pole strength of each part = mMagnetic moment of each part =M'=m'L'=mL=M2
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A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be