# Define Electric Flux. - Physics

Define electric flux.

Define electric flux. Is it a scalar or a vector quantity?

#### Solution 1

Electric flux is the total number of lines of force passing through the unit area of a surface held perpendicularly.

Electric flux ΔΦ through an area element ΔS is given by

ΔΦ = E.ΔS = EΔScosθ

θ is the angle between E and ΔS.

#### Solution 2

Electric flux is defined as the number of electric field lines crossing the per unit area. It is given as

triangle phi = vecE.vec(triangleS) cos theta

where vecE is Electric field and vec(triangleS)is area vector. The angle θ here is the angle between vecE and vec(triangle S).

Since Electric flux is the dot product of two vectors, Hence it is a Scalar quantity.

Concept: Electric Flux
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