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JoelFishel
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Post Number: 265
Posted on Tuesday, 13 May, 2014 - 02:32 pm:   

I can't understand what they're doing in this example in these notes http://www.maths.ox.ac.uk/system/files/coursematerial/2013/2643/1/Appplications2014.pdf

exercise 2.1 page 13.

"Apply Gauss’ Law to a sphere of radius r". Am I firstly right in saying that Gauss' Law is what they've previously described as Gauss' flux theorem?

If so I've only seen them describe Gauss' law for gravitation or charge i.e. you know what phi is. How have they applied it "for such a phi surface integral( gradphi . dS) = 4 * pi * r^2 * dphi/dr

??
JoelFishel
Prolific poster

Post Number: 266
Posted on Tuesday, 13 May, 2014 - 06:26 pm:   

Oh, I've sorted this out. Don't worry.

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