Question

A particle of mass $m$ and charge $q$ is placed at rest in a uniform electric field $E$ and then released. The kinetic energy attained by the particle after moving a distance $y$ is :

• A. $qE{y}^2$
• B. $q{E}^{2}y$
• C. $qEy$
• D. $q^{2}Ey$

Answer 1

The correct option is C $qEy$

K.E acquired $=$ work done
$=$ force$\times$ distance $=qE\times y=qEy$