Practice!

Sample Problem

What is the electric potential created .20 meters away from a point charge of 3.2 × 10-19 C? Estimate k as 9.00 × 109.

Solution

We will use the formula V = kQ/r. We plug in all of the known values

and get V = (9.00 × 109) (3.2 × 10-19) /.20 = 1.4 × 10-8 V