Capacitance of a sphere A is `4 mu F` while of another sphere` B` ,it is `8 mu F` .If on sphere `A` ,there is a charge `2 mu C` and on `B` the charge is `4 mu C` ,then the ratio of potential of the spheres is

two metal spheres of radii R_(1) and R_(2) are charged to the same potential. The ratio of charges on the spheres is

The capacitance of a spherical condenser is 1 mu F . If the spacing between the two spheres is 1mm , then the radius of the outer sphere is

A spherical capacitor has an inner sphere of radius 10 cm and outer sphere of radius 12 cm . The outer sphere is earthed and the inner sphere is given a charge of 5 mu C . The capacitance of the capacitor is

A parallel plate capacitor of capacitance 1 mu F has a charge of + 2 mu C on one of the plates and a charge of + 4 mu C on the other. The potential difference developed across the capacitor is

There are three conecentric hollow spheres of radii a, b and c and they are charged with charges q_(1),q_(2) and q_(3) respectively. Calculate the potential of the spheres.

Three metallic spheres A, B and C having radii are in ratio 1 : 2 : 3 . Charge on sphere A is 6 mu C and sphere B and C are electrically neutral. If sphere A first contact with sphere B and then from C and ultimately contact from sphere B, then now charge on spheres A, B and C respectively will be-