A constant torque acting on a uniform ci...

A constant torque acting on a uniform circular wheel changes its angluar momentum from `A_0` to `4 A_0` in `4 s`. The magnitude of this torque is equal to.

A

`(3 A_0)/4`

B

`A_0`

C

`4 A_0`

D

`12 A_0`

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The correct Answer is:

A

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