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Torque (vec tau) acting on a rigid body ...

Torque `(vec tau)` acting on a rigid body is defined as `vec tau = vec A xx vec L`, where `vec A` is a constant vector and `vec L` is angular momentum of the body. The magnitude of the angular momentum of the body remains same.
`vec tau` is perpendicular to `vec L` and hence torque does not deliver any power to the body.

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