Question

1-Iron pipes, steel beams, and other steel structures that remain stationary are often found to be magnetized with a distinct polarity. Explain how this can happen.

2-Suppose you have two bars, one of which is a permanent magnet and the other of which is not a magnet, but is made from a ferromagnetic material like iron. The two bars look exactly alike. Explain how you can determine the identities of the look-alike bars with the aid of a third bar that is not a magnet, but is made from a ferromagnetic material.

Answer 1

1) they are magnetised due to Earths magnetic field

2) magnet will attract the ferromagnetic bar and the iron bar will not attract it