Question

Ten electrons are equally spaced and fixed around a circle of radius R. Relative to V = 0 at infinity, the electrostatic potential V and the electric field E at the centre C are

• A. $V\ne 0$ and $\stackrel{\rightharpoonup }{E}\ne 0$
• B. $V\ne 0$ and $\stackrel{\rightharpoonup }{E}=0$
• C. $V=0$ and $\stackrel{\rightharpoonup }{E}=0$
• D. $V=0$ and $\stackrel{\rightharpoonup }{E}\ne 0$

Answer 1

The correct option is B $V\ne 0$ and $\stackrel{\rightharpoonup }{E}=0$

At centre E = 0 due to symmetry of distribution of charges where as, $V\ne 0$