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Q.

A square surface of side L meters is in the plane of the paper. A uniform electric field E (volt/m), also in the plane of the paper, is limited only to lower half of the square surface. The electric flux in SI units associated with the surface is

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a

zero

b

EL2

c

EL2/2

d

EL2/2ε0

answer is D.

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Detailed Solution

flux linked with the surface is 

ϕ=EAcosθ   where θ is the angle between the field and the normal on the coil

Here θ is 900 so flux linked is zero.

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