Question
Physics Question on electrostatic potential and capacitance
A soap bubble is charged to a potential of 16V. Its radius is then doubled. The potential of the bubble now will be :
A
16 V
B
8 V
C
4 V
D
2 V
Answer
8 V
Explanation
Solution
When radius is doubled, the capacitance is also doubled. Since, the charge remains unchanged, therefore V = q/C is halved.