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Q.

A square surface of side L meter in the pane of the paper is placed in a uniform electric field E (volt/m) acting along the same plane at an angle θ with the horizontal side of the square as shown in figure. The electric flex linked to the surface, in units of volt/m is

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a

EL2sin⁡θ

b

EL2

c

EL2cos⁡θ

d

Zero

answer is D.

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Detailed Solution

Area vector is ⊥r to the plane of the paper. The
direction of E→ is on the plane flux = E→⋅A→=0θ=900

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