Answer
3.7 km
Work Step by Step
From Coulomb's law, $F = k\frac{q_1 q_2}{r^2}$
$\implies r = \sqrt{k\frac{q_1 q_2}{F}} = \sqrt{(9 \times 10^9)\frac{(1)^2}{650}} = 3.7 \times 10^3 \ m = 3.7 \ km$
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 21 - Electric Charge and Electric Field - Problems - Exercises - Page 713: 21.7
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