Answer to Question #10504 in Electricity and Magnetism for Sidhant

Question

Let us suppose we have a loop of wire with some definite resistance in a magnetic field. Let the magnetic field be varying. This varying magnetic field will st up an EMF in the wire. My questions are as follows:

1). Energy is dissipated across the wire resistance. Where does this energy come from?

2). The current generated in the loop will also generate a varying magnetic field. Will this magnetic field generate another EMF in the loop? Will this go indefinitely?

I have another question. It is said that at resonant frequencies, a displacement produced by an applied force is amplified when compared to a displacement produced by the same amount of at non resonant frequency. Where does this additional energy come from? Also, what happens at the molecular level at resonant frequencies?