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Q.

The effective length of a magnet is 31.4 cm and its pole strength is 0.8 Am. The magnetic moment, if it is bent in the form of a semi circle is

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a

1.6

b

1.2

c

0.16

d

0.12

answer is C.

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Detailed Solution

M'=2Mπ=2×2l×mπ=2×31.4×10−2×0.83.14=0.16
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