find the work done to rotate a unit positive ...
find the work done to rotate a unit positive charge in an electric field in a complete circle of radius r.\na positive\nb negative\nc infinite\nd zero
Answer
# 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 $W=1\times0 = 0$.