# Problem: A +25 nC charge is at the origin.How much farther from the charge is the 2000 V equipotential surface than the 3000 V surface?

###### FREE Expert Solution

Electric potential:

$\overline{){\mathbf{V}}{\mathbf{=}}\frac{\mathbf{k}\mathbf{Q}}{\mathbf{R}}}$

For the 2000 equipotential surface:

V = 2000 V

k = 9.0 × 10-9 C

Q = 25 nC (10-9C/1nC) = 25 × 10-9 C

###### Problem Details

A +25 nC charge is at the origin.

How much farther from the charge is the 2000 V equipotential surface than the 3000 V surface?