Question

Two point charges, q1 and q2, are located at a distance r apart in a vacuum. The electric force between them is F. What will the electric force become if the distance between the charges in tripled?

A. F/9
B. 9F
C. 3F
D. F/3
since F = q1*q2 / r^2
if r changes to 3r, the force goes down to 1/9 as much
(3r)^2 = 9r^2

Related Questions

Charge 1 is 3 C , charge 2 is 15 C , the distance between the charges is 8 cm, and they are located... Three point charges are placed along a straight line with successive charges being 3.0 m apart. The... Two point charges qA=-6nC and qB are placed in vacuum. The charge qA is at a distance of 12cm from a... Two positive point charges Q and Q’ having charges of +4 μC and +1 μC respectively are fixed at a di...