Question

Two charges 5 uC and 20 uC are placed on two
concentric circles of radius 10 cm and 20 cm
respectively lying in x-y plane. The potential at
centre is
(1) 1.35 x 104 V
(2) 13.5 x 104 V
(3) 135 x 104 V
(4) Zero​

Answer 1

Answer:

option 3

Explanation

Potential at the centre=

kq1/r1 + kq2/r2

{9×10^9×5×10^(-6)}/0.1

+

{9×10^9×20×10^(-6)}/0.2

solve it we get 135×10^4