There Is one copper sphere and a copper shell with radii 5 cm and separated by a distance of 30 cm from the centre. They are charged to a potential of 10 V on their surfaces. The solid sphere attained a charge of Q. How much is the charge gained by the shell?

There Is one copper sphere and a copper shell with radii 5 cm and separated by a distance 30 cm from the centre. They are charged to a potential of 10 V on their surfaces. The solid sphere attained a charge of Q. What is the potential at the centres of sphere and shell?

Two spheres of Copper of same radii, one hollow and the other solid are charged to the. same potential. Which sphere has more charge?

The plates of a parallel plate capacitor have an area (20 cm^2) each are separated by a distance of 2.5 mm. The capacitor is charged by connecting it to a 400V supply. How much electrostatic energy is stored in the capacitor?