Charges`-q , Q, and -q` are placed at an equal distance on a straight liner. If the total potential energy of the system of three charges is zero, then find the ratio `Q//q`.
.

Options

A. `1//2`
B. `1//4`
C. `2//3`
D. `3//4`

Answer

b

Explanation

`U = -(k q Q)/( r) - (k qQ)/r + (k q^2)/(2 r) = 0` or `Q //q = 1//4`.