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  4. If the electric field is given by (5i + 4 j + 9k), the electric flux through a surface of area 20 unit lying in the y-Z plane will be

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Q. If the electric field is given by $(5i + 4 j + 9k)$, the electric flux through a surface of area $20$ unit lying in the $y-Z$ plane will be

AFMCAFMC 2012

Solution:

Electric flux is equal to the product of an area element and the perpendicular component of $E$. As the surface is lying in $Y-Z$ plane
$\therefore E \cdot d A =\phi =(5)(20)$
$=100$ unit