Q: LC Circuit: Q0 = 18 C & I = 0 - What is the Equilibrium Charge?

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gtman12
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At t = 0, Q0 = 18 C and I = 0 in an LC circuit.

(a) At the first moment when the energy is shared equally by the inductor and the capacitor, what is the charge on the capacitor?
 
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What have you tried on this? Start by writing the equation of potential drops around the circuit.