Cavendish’s Experiment
The figure shows the schematic drawing of Cavendish’s experiment to determine the value of the gravitational constant. The bar AB has two small lead spheres attached at its ends. The bar is suspended from a rigid support by a fine wire.
Two large lead spheres are brought close to the small ones but on opposite sides as shown. The value of G from this experiment came to be `6.67 xx 10^(-11) N-m^2'/'kg^2`.
The torque produces twist in the suspended wire. The twisting stops when
Options:
(a) restoring torque of the wire equals the gravitational torque
(b) restoring torque of the wire exceeds the gravitational torque
(c) the gravitational torque exceeds the restoring torque of the wire
(d) None of the above