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Q.

Choose the correct statements.

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a

We cannot have a situation in which total external torque is non - zero while net external force is zero.

b

The angular momentum L  and angular velocity ω  are always anti - parallel vectors.

c

The centre of gravity always coincides with centre of mass.

d

The total torque on a system is independent of the origin if the total external force is zero.

answer is A.

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Detailed Solution

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If net force on a body is zero, then net torque on a body is a constant and independent of whatever origin is taken to calculate it. Net torque on a body can only change if there is a net force on it (or) an external force action it.

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