How do I calculate capacitance on an LC circuit?

[jim the duke]

Homework Statement

Trying to calculate capacitance on an LC circuit

Homework Equations

L = 1.0H (solenoid inductance)
i = 3.0 Ma (current in circuit)
Q = 30μC (charge on capacitor)
E = 4.5μJ (energy in oscillations)

The Attempt at a Solution

All I'm after is an equation for capacitance that i can use with the given information
I know that V=IR and I=Q/T and C=Q/V but none of these tie in what I'm trying to achieve.
Any help would be great.

 

[BBAI BBAI]

Energy in oscillations means what??

 

[jim the duke]

Energy stored in the oscillations of the solenoid.

 

[BBAI BBAI]

Which is 0.5 Li2 or something else...do u know the expression for the energy...if i am wrong.

 

[jim the duke]

Sorry you've lost me

 

[BBAI BBAI]

I didn't get you...

 

[gneill]

Homework Equations

L = 1.0H (solenoid inductance)
i = 3.0 Ma (current in circuit)
Q = 30μC (charge on capacitor)
E = 4.5μJ (energy in oscillations)

Are these "Relevant Equations" for i,Q,E maximal values, or values at some particular instant of time?

Can you write the expressions for the energy stored in an inductor given the current flowing through it? How about the energy stored in a capacitor given the charge stored on it?

 

[jim the duke]

Vcap (t) = (q(t))/C
Eel = ½ CV2
EMF = Vbat – L (di(t))/dt
f = 1/(2π√LC)