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  4. A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed v on the distance x travelled by it is correctly given by (graphs are schematic and not drawn to scale)

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Q. A particle of mass $m$ and charge $q$ is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed $v$ on the distance $x$ travelled by it is correctly given by (graphs are schematic and not drawn to scale)

JEE MainJEE Main 2020Electric Charges and Fields

Solution:

$v^{2}=u^{2}+2as$
$v^{2}=0+2\left(\frac{qE}{m}\right)x$
$v^{2}=\frac{2qE}{m}x$

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