A solid conducting sphere having charge Q is surrounded by an uncharged concentric conducting spherical shell. The potential difference between the surface of solid sphere and the shell is V. The shell is now given a charge -3Q . The new potential difference between the same surfaces will be
A solid conducting sphere having charge Q is surrounded by an uncharged concentric conducting spherical shell. The potential difference between the surface of solid sphere and the shell is V. The shell is now given a charge -3Q . The new potential difference between the same surfaces will be