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## Main Question or Discussion Point

I have difficulty when trying to decide which form of Gauss's law I should use for a problem.

Please, tell me when I should use the integral form:

[tex]\int E \cdot dA = \frac{Q_{in}}{\epsilon_{0}}[/tex]

and when it's appropriate to use the other form:

[tex]E \cdot A = \frac{Q_{in}}{\epsilon_{0}}[/tex]

Please, tell me when I should use the integral form:

[tex]\int E \cdot dA = \frac{Q_{in}}{\epsilon_{0}}[/tex]

and when it's appropriate to use the other form:

[tex]E \cdot A = \frac{Q_{in}}{\epsilon_{0}}[/tex]

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