Questions

A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be

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a

M

b

M/2

c

M/4

d

2M

detailed solution

Correct option is B

If cut along the axis of magnet of length l, then new pole strength m'=m2and new length l' = l∴New magnetic moment M'=m2 x l =ml2=M2If cut perpendicular to the axis of magnet, then new pole strength m' = m and new length, l' = l/2∴New magnetic moment M'=m x l2 =ml2=M2

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If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be

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