Initially the spheres A and B are at potentials `V_A` and `V_B`. Find the potential of A when sphere B is earthed.

A metal sphere A of radius a is charged to potential V. What will be its potential if it is enclosed ny a spherical conducting shell B of radius b and the two are connected by a wire ?

Consider three concentric metallic spheres A, B and C of radii a, b, c respectively where a lt b lt c , A and B are connected whereas C is grounded. The potential of the middle sphere B is raised to V then the charge on the sphere C is–

A metal sphere A of radius 1m is charged to a potential of 20V .What will be its potential (in volt) when it is enclosed by a spherical conducting shell B of radius 2m and two are connected by a wire?

A metal sphere A of radius 1 m is charged to a potential of 20 V .What will be its potential (in volt) when it is enclosed by a spherical conducting shell B of radius 2 m and two are connected by a wire?

Metallic sphere of radius R is charged to potential V. Then charge q is proportional to

A conducting sphere is enclosed by a hollow conducting shell. Initially the inner sphere has a charge Q while the outer one is uncharged. The potential difference between the two spherical surface is found to be V. later on the outer shell is given a charge -4Q. The new potential difference between the two surfaces is : (A) V (B) -V (C) -2V (D) 2V