# Coulomb's Law quiz help

1. Feb 27, 2005

### Femme06Fatale

I was wondering if anyone would be willing to walk me through a few problems to help prepare me for a quiz tomorrow over Coulomb's law. It'd be of great appreciation if anyone would/could help me!

The first problem:
Betelgeuse, one of the brightest stars in the constellation of Orion, has a diameter of 7.0 x 10 ^11 m. Consider two compact clouds w/ opposite charge equal to 1.0 x 10 ^5 C. If these clouds are located 7.0 x 10^11m apart, what is the magnitude of the electric force of attraction between them?

2. Feb 27, 2005

### jlorino

Try using the formual
$$F=K\frac{q_{1}q_{2}}{d^2}$$
$$K=8.93\cdot10^9 \frac{Nm^2}{C^2}$$