Which of the following are the necessary and sufficient conditions for a body to have some angular acceleration about a fixed Axis?

Net external force is non-zero

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Net external torque is non-zero

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Net external torque is zero

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Angular momentum is not conserved

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Solution

The correct option is D
Angular momentum is not conserved

Angular momentum changes when there is a net external torque on the body.

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[NCERT 1974]

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