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Rotational equilibrium requires the total external torque to be:

AKept positive
BExactly zero
CAt a maximum
DKept constant
Answer & Solution
Correct answer: B. Exactly zero
1. A body in equilibrium must not start spinning. 2. That needs the turning effects to cancel. 3. So the total external torque is zero. _Source: syllabus Physics Part I, Chapter 7, Systems of Particles and Rotational Motion._
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