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  4. A square surface of side L meter in the plane of the paper is placed in a uniform electric field E(volt/m) acting along the same plane at an angle q with the horizontal side of the square as shown in figure. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/334a3f6a9475f2567d579cf55d67aa15-.jpeg /> The electric flux linked to the surface, in units of volt m is

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

AIPMTAIPMT 2010Electric Charges and Fields

Solution:

Flux of electric field $\overrightarrow{ E }$ through any area $\mathring{A}$ is defined as $\phi=E \cdot A \cos \theta$ or $\phi=\overrightarrow{ E } \cdot \overrightarrow{ A }=0$ the lines are parallel to the surface.