In an oscillating LC circuit, the total stored energy is U and the maximum current in the inductor is I. When the current in the inductor is I/2, the energy stored in the capacitor is

The definition of that same given problem is outlined in the following section on the clarification.

Explanation:

The Q seems to be endless (hardly any R on the circuit). So energy equations to describe and forth through the inducer as well as the condenser.  

Presently take a gander at the energy stored in your condensers while charging is Q.

⇒  

So conclude C doesn't change substantially as well as,

When,

⇒  

⇒  

And therefore only half of the population power generation remains in the condenser that tends to leave this same inductor energy at 3/4 U.

heat the gas and measure the pressure