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  4. A cylinder of radius r and length l is placed in a uniform electric field of intensity E acting parallel to the axis of the cylinder. The total flux over curved surface area is

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Q. A cylinder of radius $r$ and length $l$ is placed in a uniform electric field of intensity $E$ acting parallel to the axis of the cylinder. The total flux over curved surface area is

KEAMKEAM 2016Electric Charges and Fields

Solution:

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Total flux emerging from the curved surface of the cylinder,
$\phi= E \cdot ds =E d s \cos \theta $
Here, $\theta =90^{\circ}$
$\phi=E\, d s\, \cos 90^{\circ}$
$\phi=0$