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Define Electric flux and their Area element vector, electric flux through an area element. |
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Answer» Electric flux ∆ø through an area element ∆S is defined by ∆ø = E.∆S = E ∆S cos θ which, is proportional to the number of field lines cutting the area element. The angle θ here is the angle between E and ∆S. The vector area element ∆S is ∆S = ∆S ˆn where ∆S is the magnitude of the area element and ˆn is normal to the area element, which can be considered planar for sufficiently small ∆S. For an area element of a closed surface, ˆn is taken to be the direction of outward normal, by convention. The unit of electric flux is N C–1 m2. |
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