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Q.

The angular momentum of a rotating body changes from A0 to 4A0 s in 4 sec. The torque acting on the body is :

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a

34A0

b

4A0

c

3A0

d

32A0

answer is A.

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Detailed Solution

Torque τ=ΔLΔt=4A0−A04=34A0
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The angular momentum of a rotating body changes from A0 to 4A0 s in 4 sec. The torque acting on the body is :