Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 32 - The Magnetic Field - Exercises and Problems - Page 958: 41

Answer

$40\;\rm nA$

Work Step by Step

Let's assume that the axon can be represented as a long ideal current-carrying wire. So the magnetic field created by it is given by $$B=\dfrac{\mu_0I}{2\pi d}$$ We need the peak current, so $$I=\dfrac{2\pi Bd}{\mu_0}$$ Plug the known; $$I=\dfrac{2\pi (8\times 10^{-12})(1\times 10^{-3})}{(4\pi \times 10^{-7})}$$ $$I=\color{red}{\bf 4\times 10^{-8}}\;\rm A$$
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