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Electric Field due to a disk of radius R in the xy-plane
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[QUOTE="BvU, post: 6865342, member: 499340"] Great ! Would be even better to embed it in the post: in-line math enclosed in double #[COLOR=rgb(0, 0, 0)]# and displayed math enclosed in double $$ More tips: use \cos and \sin and ##\theta## instead of ##(\theta)##[/COLOR] Yep. As stated, ##dQ = \sigma \, dA = \sigma \,r'\,dr'\, d\theta## , ALL scalars. So you can't replace ##r'\ (=|r'|) ## by ## <r'\cos\theta,r'\sin\theta,0>## [ATTACH type="full"]323610[/ATTACH] (1) not correct to replace ##dA## by a vector (2) you take a dot product where you should multiply with ##|r'|## (and in the denominator you write ##r^2## instead of ##r'^{\, 2} \ ##) But I think we start repeating things :wink: . ##\ ## [/QUOTE]
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Electric Field due to a disk of radius R in the xy-plane
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