MCQ
As per this diagram a point charge $+q$ is placed at the origin $O$. Work done in taking another point charge $-Q$ from the point $A \ [$co$-$ordinates $(0, a) ]$ to another point $B\ [$co$-$ordinates $(a, 0)]$ along the straight path $AB$ is
- ✓Zero
- B$\left(\frac{- qQ }{4 \pi \varepsilon_0} \frac{1}{ a ^2}\right) \sqrt{2} a$
- C$\left(\frac{ qQ }{4 \pi \varepsilon_0} \frac{1}{ a ^2}\right) \frac{ a }{\sqrt{2}}$
- D$\left(\frac{ qQ }{4 \pi \varepsilon_0} \frac{1}{ a ^2}\right) \sqrt{2} a$
