Based on my experience on a transformer principle, I may say that an AC transformer can "breathe in" when 1. load on it remains the same 2.load on it increases 3.load on it decreases 4.load on it varies at random

8. In the circuit below, the switch is initially at position a (battery) for a long time. At t = 0 second, the switch is moved to position b. What is the magnetic energy of the inductor at t = 0.02 s? 0.1 Ω . 10-3 H m bo a 10 V

When the current in a solenoid uniformly increases from 3.0 A to 8.0 A in a time 0.25 s, the induced EMF is 0.50 volts. What is the inductance of the solenoid?   a. 25 mH   b. 40 mH   c. 30 mH   d. 35 mH   e. 20 mH

#11 Step Up Transformer A transformer primary coil has 2,300 windings, while the sec- ondary coil has 12,400 windings. If the primary coil is operated at a RMS voltage of 10.0 V, what is the RMS voltage in the secondary coil? A. 1.86 V В. 24.1 V С. 53.9 V D. 120 V