1. The problem statement, all variables and given/known data In the above circuit, the EMF from the battery is 12 V and the resistor has a resistance is 6.6 Ω. The inductor consists of a long, thin cylindrical coil of wire with 30000 turns, a radius of 5 cm and a length of 61 cm. Answer the following questions for a time 1.4 seconds after the battery has been connected. (c) How much energy has been delivered by the battery up to this point? 2. Relevant equations U = 0.5LI^2 ∫Udt from 0 to 1.4s 3. The attempt at a solution I found the inductance and the current for the 1st two parts of the problem: (a) What is the inductance of the solenoid? 14.56171141 H (b) What is the current through the battery? 0.8542201 A I plugged in the numbers to find the energy: U =0.5*14.56171141*(0.8542201^2) = 10.62556402 J Then I think that you would have to integrate over time from 0 to 1.4s which gave me a result of 7.4378948 J. It did not like the answer. Any suggestions?