How is torque on a system of particles about the origin defined? - ROTATIONAL MOTION Quiz | GKFix.in

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Question

How is torque on a system of particles about the origin defined?

A. τ = Σ (r_i · F_i)
B. τ = Σ (F_i × r_i)
C. τ = Σ (r_i + F_i)
D. τ = Σ (r_i × F_i)