- #1

rudransh verma

Gold Member

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But we cannot find it all by just looking at the field lines. We need a quantitative way of determining how much field pierces a surface. That measure is called electric flux.

Let’s take a square plate of area A.we define flux at a patch: delta phi= Ecos theta delta A. we define total flux as it’s integration.

But we know that Ecos theta is just one vector at a point. How can multiplying it with area gives us a measure of field of the patch. It would mean that the patch is filled fully with such vectors with no spacing. We know from the patterns of seeds in oil that there are gaps in between the field lines. Where is that that tells as about gaps.

simply integrating each patch would give us a volume of fully filled vectors with no spacing. Where is the gap. Are all points filled with vectors. Surely they would not be same at all points. Or are we talking about uniform field whose value is same at each point. Even then there is nothing that says about gaps in between field lines.