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The following question arises on the use of Gauss law. In the charged finite sheet problem, we consider a Gaussian surface on only one side of the sheet. But, In the case of an infinite sheet, we consider two sides for Gaussian surface. Why? I couldn't catch this idea.

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How do you use it in finite sheet problem. Plz. Tell. – ABC Apr 22 '13 at 12:08

You can't solve a finite sheet using Gauss's law, as you don't know the direction of the field from symmetry.

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