Suppose the initial charge on the capacitor is 6 mC. What is the total energy stored in the circuit initially? What is the total energy at later time?

Explanation

`E = (Q^2)/(2C) = ( (6 xx 10^(-3) )^2)/(2 xx 30 xx 10^(-6) ) = 0.6 J`
total energy is same for the later time .