Answer to Question #72945 in Physics for Linda

Question #72945

Two electric charges , originally 80mm apart , are brought closer until the force between them becomes greater by a factor of 9. How far apart are they now ?

Expert's answer

The Coulomb's law states
F=k (q_1 q_2)/r^2 .
Because F^'=9F so r^'=r/3.
Finally
r^'=(80 mm)/3=26.7 mm

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