Question

What is the force, in terms of Coulomb's constant, between two electrical charges of `8 C` and `-2 C` that are `9 m` apart?

Answer 1

This question simply requires Coulomb's Law: `F =(kq_1q_2)/r^2`. The answer is requested in terms of Coulomb's constant, and is `F =(k*8*-2)/9^2 N =(-16k)/81 N`.

Explanation:

Coulomb's Law gives the force between two charged particles, given the magnitudes of the charge on them and the distance between them.

Coulomb's constant, the `k` in the equation, is `9*10^9 Nm^2C^-2`, but in this case we have been asked to answer in terms of this constant, so we express the answer in terms of `k`.