# Find Out the Outward Flux to a Point Charge +Q Placed at the Centre of a Cube of Side ‘A’ - Physics

Find out the outward flux to a point charge +q placed at the centre of a cube of side ‘a’. Why is it found to be independent of the size and shape of the surface enclosing it? Explain.

#### Solution

Let a cube of side a enclose charge +q at its centre.

Because the electric flux through the square surface is phi=q/(6in_0)the square surfaces of cube are six. Hence, according to Gauss’s theorem in electrostatics, the total outward flux due to a charge +q of a cube is

phi=6xx(q/(6in_0))=q/in_0

The result shows that the electric flux passing through a closed surface is proportional to the charge enclosed. In addition, the result reinforces that the flux is independent of the shape and size of the closed surface.

Concept: Electric Flux
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