Question

An electron carrying charge $-e$ is located at $O$ and another charge $q$ is located at $P$. The electron is moved from $O$ to $Q$ such that $OPQ$ is an equilateral triangle. The work done in doing so is

• A. Zero
• B. $\frac{1}{4\,\pi\,\varepsilon_0}\frac{eq}{OQ}$
• C. $\frac{1}{4\,\pi\,\varepsilon_0}\frac{e^2}{OQ}$
• D. $\frac{1}{4\,\pi\,\varepsilon_0}\frac{q^2}{OQ}$

Answer 1

Answer: (A)

Zero

Answer 2

Electric potential due to q at $Q$ is same as at $O$ . i.e., potential difference between $O$ and $Q$ is zero, so work done in moving the electron is zero.