Introduction to Electrodynamics
Introduction to Electrodynamics
4th Edition
ISBN: 9781108420419
Author: David J. Griffiths
Publisher: Cambridge University Press
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Chapter 2.5, Problem 2.46P

If the electric field in some region is given (in spherical coordinates)by the expression E ( r ) = k r [ 3 r ^ + 2 sin θ cos θ sin ϕ θ ^ + sin θ ϕ ϕ ^ ] ,for some constant k. what is the charge density? [Answer: 3 k 0 ( 1 + cos 2 θ sin ϕ ) / r 2 ]

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