Two concentric spherical shells of conducting material and of radii a and b `(bgta)` are given charges `q_(1) " and " q_(2)`, respectively. Find the potential at a point at a distance r form the centre, (i) outside the two shells, (ii) between the two shells. What is the potential difference between the two shells and what will happen if they are joined by a wire?

Answer

`(i) (q_9)+q_(2))(/(4piepsi_(0)r), (ii) (1)/(4piepsi_(0))((q_(1))/(r)+(q_(2))/(b))(iii) (q_(1))/(4piepsi_90))((1)/(a)-(1)/(b))` (iv) they will acquire a common potential