Answer:
A magnetic field is created with varying intensity the current through a tape record head and either pulls or pushes the alignment of metal oxide particles either forward or backward with varying degrees of magnetic intensity. You can imagine this as the particles in the tape acting as little magnets each with their own degree of either positive or negative orientation. As a read head passes over the tape, the tape pushes and pulls the magnetic field in the read head and produces a small current. This is similar to current induction