Electric flux emanating through a surface element ( \overrig... | Physics | SolveeIt | Solveeit

Today, August 18

Question

Electric flux emanating through a surface element $\overrightarrow{ds}=5\hat{i}$ placed in an electric field $\vec{E}=4\hat{i}+4\hat{j}+4\hat{k}$ is

A

$10$ units

B

$20$ units

C

$4$ units

D

$16$ units

Answer

$20$ units

Explanation

Solution

Electric flux
$\phi=\vec{E} \cdot \overrightarrow{d s}$
$\therefore \phi=(4 \hat{i}+4 \hat{j}+4 \hat{k})(5 \hat{i})$
$=20$ units