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Average electric field over a spherical surface
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[QUOTE="JD_PM, post: 6135568, member: 655284"] [h2]Homework Statement [/h2] I was working out problem 4, chapter 3 of [I]Introduction to Electrodynamics [/I]by Griffiths: a) Show that the average electric field over a spherical surface, due to charges outside the sphere, is the same as the field at the centre. b) What is the average due to charges inside the sphere?[h2]The Attempt at a Solution[/h2] I know the solution, but there are a few aspects I do not see: [ATTACH=full]238995[/ATTACH] [ATTACH=full]238996[/ATTACH] Here you have the image Griffiths makes reference at: [ATTACH=full]238997[/ATTACH] Why ##z^2 + r^2 - R^2 = z - Rcos \theta## (law of cosines developement)? [/QUOTE]
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Average electric field over a spherical surface
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