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Question Regarding Capacitance And Inductance

by bobbles22
Tags: capacitance, inductance
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bobbles22
#1
Mar25-14, 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 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
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berkeman
#2
Mar25-14, 06:00 PM
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berkeman's Avatar
P: 41,059
Quote Quote by bobbles22 View Post
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
What does the circuit look like? Can you upload a PDF?
Baluncore
#3
Mar25-14, 08:31 PM
Sci Advisor
Thanks
P: 1,910
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.

bobbles22
#4
Mar25-14, 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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