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Homework Help: Potential Difference Across Resistor (RC Circuit)?

  1. Nov 19, 2008 #1
    1. The problem statement, all variables and given/known data

    For the RC Circuit (R = 1M Ohm, C = 1 Micro Farad and E = 30 V) find the potential difference across the resistor 10 sec after the switch is closed.

    2. Relevant equations

    V = E (1 - e^ -t/RC)

    3. The attempt at a solution

    I use the above equation but I get it wrong (it should be 4V) I think I might be putting in something wrong.
  2. jcsd
  3. Nov 19, 2008 #2
    I think there is something wrong with your numbers and equation, because if the context is charging the capacitor with the resistor in series, the capacitor would be charged in 10 seconds, and the voltage across the resistor would have decreased to zero. But in your equation, the voltage (V) would approach 30V, so it doesn't make sense.
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