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The effective length of a magnet is 31.4 cm and its pole strength is 0.5 A.m. The magnetic moment, if it is bent in the form of a semicircle will be ......................Amp.`m^2`

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The effective length of a magnet is 31.4 cm and its pole strength is 0.5 A.m. The magnetic moment, if it is bent in the form of a semicircle will be ......................Amp.`m^2` .
Options:
(a) 0.1 (b) 0.01 (c) 0.2 (d) 1.2

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