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Idea of Symmetry

A cubical gau...

Question

A cubical gaussian surface is bisected by a large sheet of charge, parallel to its top and bottom faces. No other charges are nearby. Over how many of the cube’s faces is the electric field zero?

A

0

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B

2

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C

4

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D

6

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Solution

The correct option is A $0$
The field is perpendicular to the sheet, and is nowhere zero at any face of the gaussian surface.

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