A long magnetic needle of length 2,L , magnetic moment M and pole strength m units is broken

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5.Magnetism and Matter

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A long magnetic needle of length $2\,L$, 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

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

B

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

C

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

D

$M,m$

Solution

(c)Pole strength of each part $=m$

Magnetic moment of each part

$ = M' = m'L' = mL = \frac{M}{2}$

Standard 12

Physics

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