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Question

When torque applied on a system is zero, which of the following will be constant?

A
Moment of inertia
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B
Angular momentum
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C
Kinetic energy
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D
Moment of liner momentum
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Solution

The correct option is B Angular momentum
When the torque acting upon a system is zero, the angular momentum is constant and hence is conserved. This is analogous to the linear counterpart i.e. when the force on the system is zero, the momentum is conserved.

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