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## Homework Statement

An LC circuit consists of a 1mH inductor. The capacitor is fully charged. After 2.1 ms,

the energy in the capacitor is ½ of its original value. What is the capacitance of the

circuit?

## Homework Equations

(Q/C)+ L(d^2Q/dt^2)=0

d^2Q/dt^2= -(1/LC)Q

## The Attempt at a Solution

I found the above equations in my physics book but I don't know what Q would be (it says that the capacitor is fully charged but it doesn't give an actual number), or how to get into a C= ? format in order to find the capacitance. Also I'm not even sure these are the formulas I need for this problem and if they're not then I have no idea what to do.