Physics Electronics Stage 1 Quiz

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Questions and Answers

What is the kinetic energy of the electron when it reaches the positive bar?

  • $KE = \frac{1}{2}mv^2$ (correct)
  • $KE = qEd$
  • $KE = qV$
  • $KE = \frac{1}{2}mv^2 + qV$

What is the required time for the electron to reach the positive bar?

  • $t = \frac{m}{qE}v$ (correct)
  • $t = \frac{m}{qE}v^2$
  • $t = \frac{qE}{m}v$
  • $t = \frac{2qV}{m}$

What is the exerted force on the electron in the uniform electric field?

  • $F = qV/d$
  • $F = \frac{1}{2}mv^2$
  • $F = qE$ (correct)
  • $F = m\cdot a$

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