Electric Flux | Hindi

What is Electric Flux? & Expression for finding Electric Flux. Open & Closed surfaces & how Electric Flux leads to Gauss's Law

We study that Electric flux is a property of an electric field that may be thought of as the number of electric lines of force (or electric field lines) that intersect a given area. We find that Electric flux is proportional to the number of electric field lines going through a normally perpendicular surface.

Mathematically, Electric Flux is the dot product of electric field intensity (E) and the vector area (DA). Using this definition we can easily see that maximum flux will be when surface is placed perpendicular to the electric field and flux is zero when surface is placed parallel to the electric field.

We also see how the concept of flux leads directly to Gauss’s Law. Field lines directed into a closed surface are considered negative; those directed out of a closed surface are positive. If there is no net charge within a closed surface, every field line directed into the surface continues through the interior and is directed outward elsewhere on the surface. The negative flux just equals in magnitude the positive flux, so that the net, or total, electric flux is zero and that is why Gauss’s Law says

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NCERT Class 12 Physics
Chapter – Electric Charges and Fields

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