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Potential difference required to stop a particle

  1. Mar 14, 2010 #1
    1. The problem statement, all variables and given/known data

    A particle with a charge-to-mass ratio of 50 C/kg is moving at a speed of 200 m/s. What electric potential difference is required to stop the particle?

    2. Relevant equations

    F = Eq?

    3. The attempt at a solution

    I am completely uncertain how to start this problem. Perhaps somebody can start me off?
     
  2. jcsd
  3. Mar 14, 2010 #2
    Remember that voltage is work per unit charge. Do you remember how to calculate the energy of a moving particle from your mechanics?

    [tex]\frac{1}{2}mv^2=qV[/tex]
    To find q, you need to multiply mass into that charge per mass value. The unknown mass cancels on both sides.
     
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