Coulomb’s Law

Today, lets see about the Coulomb’s Law.

Coulomb’s Law

The force of attraction between two point charges is directly proportional to the product of magnitude of charge and inversely proportional to the square of distance between them.

F = k q1 q2 / r2

COULOMB’S LAW

where k=1/(4*pi*E0) = 9 * 109 Nm2/c2 where E0 can be calculated.

For example consider the following:

When two charges are magnitude 2 C and 3 C separated by 6 m distance. The force of attraction between them can be found using the above formula

q1=2 C

q2=3 C

r = 6 m

So F = (k (2 C)(3 C))/ 36 m2

So F = k/6 where k= 9 * 109

Ans: 1.5 * 109 N