Since one male in the class thinks the two females in my IB physics class are dumb (I being one of them), we are determined to do very well on tonight's problems. We don't have a teacher that actually teaches, I don't know how to approach some of the problems. Here is goes (please help! thanks) There is an electric current in a coil (in a dc circuit), which is connected to a battery with an emf of 4 volts. The steady state value of the current is 2 Amperes. One of the questions asks to prove that the t (the greek t)= L/R given that the rate at which the current changes is V/L (L being inductance). I think I might have gotten that, but it then asks to determine the value of the inductance and I got 1 ohm second because I said that t was equal to the time constant ( or the time it would take to reach the 2 Amperes if it were to continue at the initial rate), which was 0.5. So, using the t= L/R, I got 0.5 = L/2 which was 1. Is that right? I have more questions about other ones, but I don't want to ask too many on this thread.