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The net external torque on a system of p...

The net external torque on a system of particles about an axis is zero. Which of the following are compatible with it ?

A

The force may be acting radially from an external point

B

the force may be actin in side the axis of rotations.

C

the force may be acting parallel to the axis of rotation

D

the torque caused by some forces may be un-equal and in the same direction

Text Solution

Verified by Experts

The correct Answer is:
C
We know that torque on a system of particles `bar(tau)=bar(r)xxbar(F)=Fr sin thetahatn`
When force acting parallel to the axis of rotation `theta=0^(@), |bar(tau)|=0`
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