A circular coil of 100 turns and effecti...

A circular coil of 100 turns and effective diameter `20cm` carries a current of `0.5A`. It is to be turned in a magnetic field of `B=2.0T` from a position in which the normal to the plane of the coil makes an angle `theta` equals to zero to one in which `theta` equals to `180^(@)`. The work required in this process is

`pi` `J`

`2pi` `J`

`4pi` `J`

`8pi` `J`

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