$A$ particle having mass $m$ and charge $q$ is at rest. On applying a uniform electric field $E$ on it,it starts moving. When this particle travels a distance $x$ in the direction of the force,its kinetic energy will be . . . . . . .
- A$q E^2 x$
- B$q^2 E x$
- C$q E x^2$
- D$q E x$
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