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The second condition of equilibrium requires that the net external torque be:

AEver growing
BExactly zero
CVery large
DStraight up
Answer & Solution
Correct answer: B. Exactly zero
1. Any unbalanced torque would start rotation. 2. Equilibrium forbids that rotation too. 3. So the net torque must be exactly zero. _Source: OpenStax University Physics Volume 1, Chapter 12, Static Equilibrium and Elasticity._
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