Two point charges placed at a distance apart exert a force on each other

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Two point charges placed at a distance dd apart exert a force FF on each other. If the first charge is doubled and the second charge is tripled, what should be the new separation so that the magnitude of the force remains FF? (a) 6d6d (b) 6 d\sqrt{6}\,d (c) d6\dfrac{d}{\sqrt{6}} (d) d2\dfrac{d}{\sqrt{2}}

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