Thursday, May 8, 2008

IIT JEE Physics Concept Review - Fa-Fm

Flux of an electric field

If in a plane surface area of ∆s, a uniform electric field E exists, and makes an angle θ with the normal to the surface area (positive normal - you can arbitrarily decide which direction is positive), the quantity

∆Φ = E ∆s cos θ

is called the flux of the electric field through the chosen surface.

If ∆s is represented as a vector
∆Φ = E.∆s

Where E and ∆s are vectors and ∆Φ is a scalar quantity.
(Chapter: Gauss's Law)

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