A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle along its length. The magnetic moment and pole strength of each piece will be
A
M2,m2
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B
M,m2
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C
M2,m
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D
M,m
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Solution
The correct option is CM2,m
M=ml=2mL
Pole strength of each part =m
Magnetic moment of each part =M′=m′L′=mL=M2