If one of the charges is doubled in magnitude while maintaining the same separation between the charges, what is the new magnitude of the force between them?

Explanation:

Force between two charges is given by

where q₁ and q₂ are charges and r is the distance between them.

Here one charge is doubled with keeping all others same.

            q₁ = 2 q₁

We have

Magnitude of force doubles.

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