Question

Find the electric potential at a point located at 0.05m of a charge of +8x10^-6C. Find the potential energy of a charge of 3x10^-9C that is located at that same point.

Answer 1

Find the electric potential at a point located at 0.05 m of a charge of +8x10^-6 C:

$$\phi=\frac{kq}r=1.44\text{ MV}.$$

The potential energy of the charge is

$$U=\phi Q=4.32\text{ mJ}.$$