Electric Potential Video Lessons

Concept

Problem: a. What is the electric potential at point A in the figure above?b. What is the potential energy of a proton at point A?

FREE Expert Solution

The potential at point Ais the sum of potentials due to each charge.

Given that there are many charge sources, the electric potential at a point is the sum of the potentials due to each charge.

$\overline{){\mathbf{V}}{\mathbf{=}}\mathbf{\sum }_{\mathbf{i}}{\mathbf{K}}\frac{{\mathbf{q}}_{\mathbf{i}}}{{\mathbf{r}}_{\mathbf{i}}}}$

Electric potential energy:

$\overline{){\mathbf{U}}{\mathbf{=}}{\mathbf{qV}}}$

Let's consider the labeled diagram below:

a.

The potential at point A due to the charge is:

V = kqB/rAB + kqc/rAC + kqD/rAD

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Problem Details

a. What is the electric potential at point A in the figure above?

b. What is the potential energy of a proton at point A?