A square surface of side L metre in the plane of the paper is placed in a uniform electric field E (V/m), along the same plane at an angle θ with the horizontal side of the square as shown. The electric flux linked to the surface in units of V-m is: [Diagram: Image]
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Question

A square surface of side L metre in the plane of the paper is placed in a uniform electric field E (V/m), along the same plane at an angle θ with the horizontal side of the square as shown. The electric flux linked to the surface in units of V-m is: [Diagram: Image]

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G1 Physics · Accepted Answer

Step 1: Electric flux Φ = E⃗·A⃗ = EA cosα, where A⃗ is normal to the surface. Step 2: Here E⃗ lies in the plane, hence α = 90°. Step 3: Φ = EL² cos90° = 0.