Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question Regarding Capacitance And Inductance

  1. Mar 25, 2014 #1
    Hi there,

    I'm doing a home study course including a section on dynamic fields and waves. I am trying to understand how to find capacitance using initial charge, inductance and energy.

    From a previous section, I know I can find the maximum current using Um=1/2 LI2

    However, I can't see how to find the capacitance. Can anyone point me in the right direction please.

    Many thanks

    Bob
     
  2. jcsd
  3. Mar 25, 2014 #2

    berkeman

    User Avatar

    Staff: Mentor

    What does the circuit look like? Can you upload a PDF?
     
  4. Mar 25, 2014 #3

    Baluncore

    User Avatar
    Science Advisor

    Knowing the initial charge and energy should be enough to compute capacitance.

    From the definition of capacitance, C = Q / V
    therefore V = Q / C.

    We know that the energy stored in a capacitor is, E = ½ C V^2

    therefore E = ½ C (Q/C)^2
    so E = ½ Q^2 / C
    hence C = ½ Q^2 / E.
     
  5. Mar 25, 2014 #4
    Its a simple circuit with just a capacitor and a solenoid, nothing else
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Question Regarding Capacitance And Inductance
  1. Inductance question (Replies: 2)

Loading...