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The effective length of a magnet is 31.4...

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 semicircle is _____ `Am^(2)`.

A

`1.2`

B

`1.6`

C

`0.16`

D

`0.12 `

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