# Electric constant

1. Aug 28, 2010

### praveenpp

hi everyone,

what is mean by electric constant?
electric constant=1/(magnetic constant * speed of light)

please explain this equation.

2. Aug 28, 2010

### Staff: Mentor

In that equation, the "electric constant" is the $\epsilon_0$ that appears in Coulomb's law for the electric force between two point charges:

$$F_e = \frac{1}{4 \pi \epsilon_0} \frac {q_1 q_2}{r^2}$$

3. Aug 29, 2010

### praveenpp

thank u for reply. what is mean by epselon zero(electric constant) please explain about that