The initial electrostatic potential energy stored in a capacitor is EsE_sEs. The capacitor discharges through a resistor in a circuit with a time constant τ\tauτ. The base of natural logarithms is eee. What is the energy stored in the capacitor after a time τ\tauτ?
Ese\frac{E_s}{e}eEs
Ese2\frac{E_s}{e^2}e2Es
Es2\frac{E_s}{2}2Es
Esln2E_s \ln 2Esln2
