College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 16 - Problems - Page 618: 88


The rat must come within $1.3~meters$ of the charge.

Work Step by Step

We can find the distance $r$ from the charge where the electric field is $5.0~kN/C$: $E = \frac{k~q}{r^2}$ $r^2 = \frac{k~q}{E}$ $r = \sqrt{\frac{k~q}{E}}$ $r = \sqrt{\frac{(9.0\times 10^9~N~m^2/C^2)(1.0\times 10^{-6}~C)}{5.0\times 10^3~N/C}}$ $r = 1.3~m$ The rat must come within $1.3~meters$ of the charge.
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