Question

The work done to complete one revolution in a circle of radius r by a charge Q, if a charge Q is placed at the centre of the circle will be

• A. $ \frac{Q}{4\pi {{\varepsilon }_{0}}r} $
• B. $ \frac{{{Q}^{2}}al}{4\pi {{\varepsilon }_{0}}r} $
• C. zero
• D. $ \frac{Qal}{2r} $

Answer 1

Answer: (C)

There will be same potential on all the points of the charged circle and hence work done by charge in moving on circular path will be zero.