If three forces P, Q, R acting at a point are in equilibrium and P = Q = R, the angles between the forces must be:

Type: MCQ • Marks: 1

A. 90°, 90°, 180°

B. 60°, 60°, 60°

C. 180°, 90°, 90°

D. 120° each

Explanation

By Lami's theorem: P/sin α = P/sin β = P/sin γ ⇒ sin α = sin β = sin γ. Since α + β + γ = 360°, each angle must be 120°.

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UP TGT Mathematics

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