A circular coil of radius 4 cm has 50 tu...

A circular coil of radius 4 cm has 50 turns. In this coil a current of `2 A` is flowing. It is placed in a magnetic field of `0.1 "weber"//m^(2)`. The amount of work done is rotation it through `180 ^(@)` from its equilibrium position will be

`0.1J`

`0.2J`

`0.4J`

`0.8J`

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