In an experiment using the Cavendish balance , the smaller spheres have a mass of 20 kg each , the larger spheres have a mass 5 kg each , the length of the rod is `50.0` cm the torsion constant of the fibre is `4.8 xx 10^(-8)` Nm per radian , the angle of twist is `7 xx 10^(-3)` rad , and the distance between the centres of each pair of heavy and light spheres is 100 cm . Compute the value of the gravitational constant G from this data .

Answer

`6.72 xx 10^(-11) Nm^(2) kg^(-2)`