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Practice question

MCQ

Question

A force F\=4i^−3j^N acts at r\=2i^+1j^m. What is the magnitude of the torque about the origin?

Options

Choose one · Correct answer highlighted

Explanation

τ = r×F = |i^j^k^2104−30| = k^(2×(−3)−1×4) = k^(−6−4) = −10k^Nm. Magnitude = 10Nm. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 10 Nm. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.

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