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  4. A point charge + q is placed at the midpoint of a cube of side L. The electric flux emerging from the cube is

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Q. A point charge + q is placed at the midpoint of a cube of side L. The electric flux emerging from the cube is

JamiaJamia 2006

Solution:

From Gauss theorem, the electric flux $ (\phi ) $ through any closed surface is equal to $ \frac{1}{{{\varepsilon }_{0}}} $ times the net charge q enclosed by the surface. Thus,
$ \phi =\int{\overrightarrow{E}}.dA=\frac{q}{{{\varepsilon }_{0}}} $

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