Question

What is the force, in terms of Coulomb's constant, between two electrical charges of `-1 C` and `-2 C` that are `4 m` apart?

Answer 1

Use Coulomb's law that describes force between static electrically charged particles. In its scalar form the law is:
`F=k_e|q_1q_2|/ r^2`
`F=8.99×10^9 Nm^2 C^-2|(-1C)(-2C)|/( 4^2 m^2) = 1.12×10^9N`
That is a large force, it should give you an idea how large a coulomb really is. It's a huge amount of charge

Explanation:

Use Coulomb's law that describes force between static electrically charged particles. In its scalar form the law is:
`F=k_e|q_1q_2|/ r^2` where `k_e = 8.99×10^9 Nm^2 C^-2`
Now substituting the given charges and distance of separation:

`F=8.99×10^9 Nm^2 C^-2|(-1C)(-2C)|/( 4^2 m^2) = 1.12×10^9N`
That is a large force, it should give you an idea how large a coulomb really is. It's a huge amount of charge