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(i) Can two equaipotential surfaces inte...

(i) Can two equaipotential surfaces intersect each other ? Give reasons
(ii) Two charges `-q and +q` are located at point A (0, 0 -a) and B(0, 0, +a) respectively. How much work is done in moving a test charge from point `P (7, 0, 0) " to " Q(-3, 0, 0)` ?

A

`(qa)/(4piepsilon_0z^2)`

B

`(q)/(4piepsilon_0z^2)`

C

`(2qa)/(4piepsilon_0(z^2-a^2))`

D

`(2qa)/(4piepsilon_0(z^2+a^2))`

Text Solution

Verified by Experts

The correct Answer is:
C

`V_P=K[(-q)/((z+a))+(q)/((z-a))]=Kq [(-z+a+z+a)/(z^2-a^2)]`
`= (2qa)/(4pi epsilon_0 (z^2 -a^2))`
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