Q147 / 160 · AP EAMCET 2015 · Physics

In a region of uniform electric field of intensity $E$, an electron of mass $m_e$ is released from rest. The distance travelled by the electron in a time $t$ is

  • A
    $\frac{2 m_e t^2}{e}$
  • Correct answer
    B
    $\frac{e E t^2}{2 m_e}$
  • C
    $\frac{m_e g t^2}{e E}$
  • D
    $\frac{2 E t^2}{e m_e}$

Solution

$a=\frac{F}{m_e}=\frac{e E}{m_e}$ As, $S=\frac{1}{2} a t^2=\frac{1}{2} \frac{e E}{m_e} t^2$

Hence, the correct answer is option: 'B'.

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