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Question

If torque acting on a system is zero, the quantity that remains constant is

A
force
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B
linear momentum
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C
angular momentum
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D
angular velocity
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Solution

The correct option is C angular momentum
As we know,
τ=dLdt
where τ= torque
dL= change in angular momentum
If τ=0,dLdt=0
Hence, L= constant
So, if net torque on the system about an axis is zero, then angular momentum of that system about that axis is conserved.
Hence, option (c) is correct.

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