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Question
On a disc of radius R a concentric circle of radius R/2 is drawn. The disc is free to rotate about a fritionless fixed axis through its centre and perpendicular to plane of the disc. All three force (in plane of the disc) shown in figure are exerted tangent to their respectively circular periphery. The magnitude of the net torque (about centre of disc) acting on the disc is:
On a disc of radius R a concentric circle of radius R/2 is drawn. The disc is free to rotate about a fritionless fixed axis through its centre and perpendicular to plane of the disc. All three force (in plane of the disc) shown in figure are exerted tangent to their respectively circular periphery. The magnitude of the net torque (about centre of disc) acting on the disc is:
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Solution
The correct option is C 2.3 FR
torque=force*distancenet torque=2F(2R)+F(R)−F(2R)=3FR
torque=force*distance
net torque=2F(2R)+F(R)−F(2R)=3FR
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