1. The problem statement, all variables and given/known data 1. A 5.0 H inductor is connected to a 120 V rms, 60 Hz ac power supply. Periodically, the energy stored in the inductor reaches a maximum value. What is this maximum value? A) 0.010 J B) 0.020 J C) 0.40 J D) 0.80 J E) 10.0 J 2. A standing wave on a string is represented by the equation y = A sin (kx) cos (ωt). The distance between consecutive nodes is: A) ∏/k B) ∏/ω C) 2∏/k D) k/∏ E) ω/∏ 3. The attempt at a solution These were two questions from an exam I had today and I wanted to check to see if my thinking was correct? For the first question, I put C. I first found the period, 1/f, and got 1/60 = .0167 sec. Next, I divided the 120 V rms by 5 H and got an answer of 24 V/H. Finally, I multiplied the frequency into this value and got an answer of 0.40 J. Was this correct? For number 2, I rationalized that a node corresponds to half of a wavelength, which is equivalent to pi. And I know that k is equal the number of wave peaks in a wave. Therefore, out of the choices possible, I thought that A made the most sense. If anyone could confirm whether or not that is correct, I would appreciate it.