A square surface of side L metres is in the plane of the paper. A uniform electric field E⃗ is also in the plane of the paper and is limited only to the lower half of the square surface. Electric flux in SI units associated with the surface is: [Diagram: Image]
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Question

A square surface of side L metres is in the plane of the paper. A uniform electric field E⃗ is also in the plane of the paper and is limited only to the lower half of the square surface. Electric flux in SI units associated with the surface is: [Diagram: Image]

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G1 Physics · Accepted Answer

Step 1: Flux is the surface integral Φ = ∫E⃗·dA⃗. Step 2: Both the electric field and sheet are in the same plane, so field is perpendicular to the surface normal everywhere. Step 3: E⃗·dA⃗ = 0 even over the lower half; total flux is zero.