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Q.

In the figure are shown the lines of action and moment arms of two forces about the origin O. Imagining these forces to be acting on a rigid body pivoted at O, all vectors shown being in the plane of the figure, the magnitude and direction of the resultant torque will be:

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a

(F2r2sinθ2F1r1sinθ1) out of the plane of the page.

b

(F1r1sinθ1F2r2sinθ2) out of the plane of the page.

c

(F2r2sinθ2F1r1sinθ1) into the plane of the page

d

Zero

answer is C.

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Detailed Solution

τ=rFsinθ; Clockwise negative and anti clockwise positive

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