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Homework Help: Creating potential difference

  1. Mar 26, 2009 #1
    1. The problem statement, all variables and given/known data
    The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 volt potential difference is suddenly applied to the initially uncharged plates through a 900 ohm resistor in series with the deflection plates. How long does it take for the potential difference between the deflection plates to reach 50 volts?

    2. Relevant equations

    3. The attempt at a solution
    There has to be an equation that I am missing or need
  2. jcsd
  3. Mar 26, 2009 #2


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    Homework Helper

    The whole problems converts into a RC circuit.
    Find the expression for the charging of the capacitance.
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