find the work done to rotate a unit positive charge in an electric field in a complete circle of radius…

Answer:

d. Zero

Explanation:

Step1: Recall work - potential relation

Work done $W = q\Delta V$.

Step2: Analyze potential in a circular path

In an electric field, for a complete circular path, initial and final points are same. So, $\Delta V=V_{final}-V_{initial} = 0$.

Step3: Calculate work done

Given $q = 1$ (unit positive charge). Substituting $q = 1$ and $\Delta V=0$ into $W = q\Delta V$, we get $W=1\times0 = 0$.