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Q.

A constant torque acting on a uniform circular wheel changes its angular momentum from A to 4A in 4S.  The torque acted on it is.              

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a

A4

b

3A4

c

3A2

d

2A3

answer is A.

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Detailed Solution

Change in angular momentum ΔL=Lf−Li=4Ao−Ao=3Ao  Time taken ΔT=4s  Magnitude of torque τ=ΔLΔT=3A04

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