Q.

The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be

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a

0.4 Am2

b

1.6 Am2

c

20 Am2

d

8.0 Am2

answer is A.

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Detailed Solution

M=mL=4 x 10 x 10-2=0.4 Am2
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The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be