Question

There is a uniformly charged disc of radius $R\sqrt{3}$ and surface charge density $\sigma$ work done by electric field to brought a charge $\varrho$ From centre of disc to distance R along its axis will be :-

• A. $\frac{\sigma QR(\sqrt{3}-1))}{2{ϵ}_{\sigma }}$
• B. $\frac{\sigma QR}{2{ϵ}_{\sigma }}(\sqrt{2}-1))$
• C. $\frac{\sigma QR}{2{ϵ}_{\sigma }}(\sqrt{3}-1)$
• D. $\frac{\sigma QR}{{ϵ}_{\sigma }}$

Answer 1

Answer: (C)