What is the total energy dissipated by the resistor R after the switch is thrown?
Consider the RC circuit in the figure below. The switch was at position a for a long period and it is suddenly switched to position b at time t = 0.

http://s1.postimage.org/nqpr2v8yf/prob01a_rccircuit.gif

so I did that What is Vc at time t = 2.00 ms?
Use the following data : R = 452.5 Ω, C = 4.00 μF, Vb = 3.75 V.
1.242 V it's correct..
my problem is with this one :

******What is the total energy dissipated by the resistor R after the switch is thrown?
I did w=-(epsilon^2)*C/2
I got -2.8125*10^-5 J