Question

Two charges Q1=5nc and Q2=-7nc are separated by 8 cm. Calculate the electric potential at point A

Answer 1

The electric potential at any point $A$ is given as follows:

$$\varphi_A = k\dfrac{Q_1}{r_1} + k\dfrac{Q_2}{r_2}$$

where $Q_1=5nC, Q_2 = -7nC$ are the charges, $r_1, r_2$ are the distances to point $A$ from the first and the second charge respectively, and $k\approx 9\times 10^9N\cdot m^2/C^2$ is the Coulomb's constant. The particular value of $\varphi _A$ depends on the location of point $A$.