Physics

Problem

Positive and negative point charges of equal magnitude are kept at

\left(0, 0, \frac{a}{2}\right)

and

\left(0, 0, -\frac{a}{2}\right)

respectively. The work done by the electric field when another positive point charge is moved from

(-a, 0, 0)

(0, a, 0)

is a. positive b. negative c. zero d. depends on the path connecting the initial and final positions