Write Coulomb's law in vector form and explain the terms.

Explanation

`vecF_(21)=(1)/(4pi epsilon_0)(q_1q_2)/(r_(21)^2)hatr_(21)`
where `vecF_(21) rarr` Force on `q_2` due to `q_1`
`vecr_1`and `vecr_2` are the position vectors of `q_1` and `q_2` and `hatr_(21) rarr` unit vector in the direction of `vecr_(21)`