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Cylindrical Gaussian surface

In the example calculation shouldn't it be $\oiint EdA\cos 90$ rather than $\oiint E\cdot dA\cos 90$ . Aren't we replacing the dot product with its definition? 186.42.32.13 (talk) 20:42, 13 February 2010 (UTC)[reply]

Spherical Surfaces

What is the reason that in a spherical, charges are present in the outersurface of the sphere? please answer me in email kalyan_kapil@yahoo.co.in waiting for reply please

- In the example given, the distribution of charge is a spherical shell, which means the charge is only present on the surface of the sphere Dom

Closed Surface Integrals

My math prof. told me that it's not an acceptable notation in math for an integral over closed surface. can anyone please post me a ref for the notation ? —Preceding unsigned comment added by 84.108.164.54 (talk) 23:02, 27 November 2007 (UTC)[reply]