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Q.

If a bar magnet of magnetic moment 80 units be cut  perpendicular to axis into two halves of equal lengths, the magnetic moment of each half will be

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a

80 units

b

40 units

c

160 units

d

20 units

answer is B.

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Detailed Solution

Let pole strength =m​∴M=m×l when l'=l2​then M'=m×l'=ml2=M2=40 unit
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