The net external torque on a system of particles about an axis is zero. Which of the following are compatible with it?
a) The forces may be acting radially from a point on the axis
b) The forces may be acting on the axis of rotation
c) The force may be acting parallel to the axis of rotation
d) The torque caused by some forces may be equal and opposite to that caused by other

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a, b only

b, c only

a, d only

All

answer is D.

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Detailed Solution

Given that net external torque on a system of particles about an axis is zero that means

(i) the forces may be acting radially from a point on the axis

(ii) the torque caused by same forces may be equal and opposite to that caused by other forces.

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