Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 20 - Magnetism - General Problems - Page 588: 86

Answer

0.1 N. Your answer may vary depending on the estimates you make.

Work Step by Step

In Example 18–10, the current in a lightning bolt is estimated to be 100 A. Use equation 20–2 to find the force on the pole, assuming the Earth’s magnetic field is horizontal. Assume the flag pole is 20 m tall. $$F=I\mathcal{l}B $$ $$F= (100A)(20m)(5.0\times10^{-5}T) =0.1N $$
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