Explain briefly how moving electric charges at an atomic level produce magnetically polarized domains in a sample of iron, and how the domain structure differs for a magnetized iron bar and one that is not magnetized. if anyone can explain this, it would be wonderfl.

1.Iron atoms tend to form regions, clusters. These are what become magnetized and then affected by magnetic fields
Answer 2
.When two magnets are brought near each other, like poles repel; opposite poles attract.
2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.

Wavelength divides in half and speed stays the same.