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A conducting ring of mass 2kg and radius...

A conducting ring of mass 2kg and radius `0.5m` is placed on a smooth plane. The ring carries a current of `i=4A`. A horizontal magnetic field `B=10 T` is switched on at time `t=0` as shown in fig The initial angular acceleration of the ring will be
.

A

`40pirad//s^(2)`

B

`20pirad//s^(2)`

C

`5pirad//s^(2)`

D

`15pirad//s^(2)`

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The correct Answer is:
A
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