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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