Question

In a region of space the electronic field is given by$\overrightarrow{E}=\left(8\hat{i}+4\hat{j}\right)N/C$. The electric flux through a surface of area $10m^2$ in the x-y plane is

• A. 80 units
• B. 40 units
• C. 120 units
• D. Zero

Answer 1

The correct option is D Zero

$\overline{E}=(8\hat{i}+4\hat{j})N/c$.

Electric flux through a surface of area $={10m}^2$

$\varphi =E.A$

$=(8\hat{i}+4\hat{j}).10{\cos 90}^0$ ($\because$ Electric field and flux are perpendicular to each other)

$=0[\because \cos {90}^0=0]$