Three point charges IC, -2C and -2C are placed at the vertices of an equilateral triangle of side I m. The work done by an external force to increase the separation of the charges to 2 m in joule is (`epsilon_(0)` = Permittivity of air)

Options

A. `1/4pi epsilon_(0)`
B. `1/8pi epsilon_(0)`
C. `1/16pi epsilon_(0)`
D. Zero

Answer

(d)

Explanation

Initially and finally the net force is zero.Therefore, the work done by the external force is zero.