Two particles with charges $+q$ and $-q$ are separated by a distance of $2d$. What is the electric potential at the midpoint of the line joining them?
- A$0$
- B$\frac{1}{4\pi\varepsilon_0}$
- C$\frac{1}{4\pi\varepsilon_0} \cdot \frac{q}{d}$
- D$\frac{1}{4\pi\varepsilon_0} \cdot \frac{2q}{d^2}$
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