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On a disc of radius `R` a concentric circle of radius `R//2` is drawn. The disc is free to rotate about a frictionless fixed axis through its center and perpendicular to plane of the disc. All three forces `(` in plane of the disc `)` shown in figure are exerted tangent to their respective circular periphery. The magnitude of the net torque `(` about centre of disc `)` acting on the disc is `:` A. `1.5FR`B. `1.9FR`C. `2.3FR`D. `2.5FR` |
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Answer» Correct Answer - A Torque `tau=(2F)R+F((R)/(2))+FR(-1)` `=(3FR)/(2)` |
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