Question

Two rings each of radius R have charges Q and -Q. Their axes coincide and their centres are separated by a distance R. Find the work done in moving a charge q from the centre of the first ring to the centre of the second ring.

• A. $\frac{kQq}{R}$
• B. zero
• C. $\frac{kQq}{R}(2-\sqrt{2})$
• D. $\frac{3kQq}{2R}$

Answer 1

The correct option is C $\frac{kQq}{R}(2-\sqrt{2})$