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Question: A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two ...

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

A

M2,m2\frac { M } { 2 } , \frac { m } { 2 }

B

M,m2M , \frac { m } { 2 }

C

M2,m\frac { M } { 2 } , m

D

M,mM , m

Answer

M2,m\frac { M } { 2 } , m

Explanation

Solution

Pole strength of each part = m

Magnetic moment of each part

=M′=m′L′=mL=M2= M ^ { \prime } = m ^ { \prime } L ^ { \prime } = m L = \frac { M } { 2 }