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  4. A uniform electric field E exists between the plates of a charged condenser. A charged particle enters the space between the plates and perpendicular to E. The path of the particle between the plates is a :

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Q. A uniform electric field $\overrightarrow{E}$ exists between the plates of a charged condenser. A charged particle enters the space between the plates and perpendicular to $\overrightarrow{E}$. The path of the particle between the plates is a :

JEE MainJEE Main 2013Electrostatic Potential and Capacitance

Solution:

When charged particle enters perpendicularly in an electric field, it describes a parabolic path
$y = \frac{1}{2}\left(\frac{QE}{m}\right)\left(\frac{x}{4}\right)^{2}$
This is the equation of parabola.

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