Question

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.

The electric flux linked to the surface, in units of volt $m$ is

• A. $E{L}^2$
• B. $E{L}^2\cos \theta$
• C. $E{L}^2\sin \theta$
• D. zero

Answer 1

Answer: (D)

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