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According to the principle of moments, a body under several parallel forces is in equilibrium when
ATotal clockwise moment equals total anticlockwise moment
BTotal clockwise moment exceeds total anticlockwise moment
CThe sum of all the forces equals the largest force
DEvery force acts at the same single point
Answer & Solution
Correct answer: A. Total clockwise moment equals total anticlockwise moment
1. The principle of moments applies to a rigid body in equilibrium.
2. It states the algebraic sum of clockwise moments equals that of anticlockwise moments.
3. Equivalently, the net moment about any point is zero.
4. Rule out option B: if one moment exceeds the other, the body would rotate, not be in equilibrium.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.12_
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