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Forces are applied on a wheel of radius 20 cm as shown in the figure. The torque produced by the forces 4 N at A, 8 N at B, 6 N at C and 9 N at D at angles indicated is

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5.4 N-m anti – clockwise

1.80 N-m clockwise

2.0 N-m anti – clockwise

3.6 N-m clockwise

answer is B.

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Detailed Solution

$\begin{array}{l} τ = (9 \times 0.2 - 4 \times 0.2 + 8 \times \sin 30 ° \times 0.2) = 1.8 N - m \\ (C l o c k w i s e) \end{array}$

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