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 given by:

• A. $zero$
• B. $2\pi RLE$
• C. $2\pi R^{2}E$
• D. $2\pi RE(R+L)$

Answer 1

Answer: (A)

$zero$

At any point on the curved surface, E and area vector are perpendicular to each other
therefore $E.dS=0$
$\Rightarrow \varphi =0$