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Question Regarding Capacitance And Inductance 
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#1
Mar2514, 04:35 PM

P: 17

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 U_{m}=1/2 LI^{2} However, I can't see how to find the capacitance. Can anyone point me in the right direction please. Many thanks Bob 


#3
Mar2514, 08:31 PM

Sci Advisor
Thanks
P: 1,954

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. 


#4
Mar2514, 09:42 PM

P: 17

Question Regarding Capacitance And Inductance
Its a simple circuit with just a capacitor and a solenoid, nothing else



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