Question

A charge situated at a certain from an electric dipole (small), in the end on position, experience a force $F$. Find the force acting on the same charge due to same dipole if its distance from the centre of dipole is doubled.

• A. $F/8$
• B. $F/4$
• C. $3F/8$
• D. $F/2$

Answer 1

The correct option is A $F/8$

Force acting due to dipole at r distance

$=F\propto \frac{1}{r^3}$

Centre getting double distance.

hence

$F^{\prime }=\frac{F}{8}$.