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When slightly different weights are placed on the two pans of a beam balance,the beam balance comes to rest at an angle with the horizontal.The beam is supported at a single point P by a pivot
(A)The net torque about P due to the two weights is non-zero at the equilibrium position
(B)The whole system does not continue to rotate about P because it has a large moment of inertia
(C)The centre of mass of the system lies below P
(D)The centre of mass of the system lies above P
The centre of mass in this case lies above the pivot. The net torque has to be zero about P as the beam balance is in rotational equilibrium. We also know that the centre of mass of the body may lie outside the body as well.
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