A transformer works because (select all that are true): Group of answer choices a. Time varying magnetic fields passing through a coil of wire will induce a voltage. b. Time varying current will produce a time varying magnetic field. c. Transformers only work in the movies, they are not real d. Electron beams can be steered by a magnetic field e. Increasing the number of coils will increase the magnetic field produced by a current f. Transistors inside the transformer exchange voltage for current