Question

An electron having charge $e$ and mass $m$ is moving in a uniform electric field $E .$ Its acceleration will be

• A. $\frac{e^{2}}{m}$
• B. $\frac{eE}{m}$
• C. $\frac{eE^{2}}{m}$
• D. $\frac{mE}{e}$

Answer 1

Answer: (B)

$\frac{eE}{m}$

Answer 2

Charge on electron $= e$ Mass of electron $= m$ and intensity of uniform electric field $= E$. Acceleration of the electron, $a=\frac{\text{Force on the electron}}{\text{Mass of electron}}$ =\frac{\text{Electric charge \times electric field}}{\text{Mass of electron}}=\frac{eE}{m}.