Question

A cylinder of radius $R$ and length $l$ is placed in a uniform electric field $E$ parallel to the axis of the cylinder. The total flux over the curved surface of the cylinder is :

• A. Zero
• B. $\pi R^{2}E$
• C. $2\pi R^{2}E$
• D. $E/\pi R^2$

Answer 1

The correct option is A Zero

For the curved surface,

At any point on the curved surface, $E$ and area vector are perpendicular to each other.

$\theta ={90}^o$

$\therefore \varphi =Eds\cos {90}^o=0$