Question

35. A soap bubble is charged to a potential 12 V. If its
radius is doubled, then the potential of the bubble
becomes
[Kerala CET 2013]
(a) 12 V
(b) 24 V
(c) 3 V
(d) 6 V
(e) 9V​

Answer 1

soap bubble can be treated as a hollow sphere. .

kq/r = 12

when radius is doubled= kq/2r = 6v