GEOLOGY

Detailed explanation-1: -When particles are placed in a large external magnetic field (B) their spins will align with the magnetic field. Most of the spins will align with the magnetic field (parallel), as that is the lower-energy option. However, a few will align against the external field (anti-parallel) if they are at a higher energy.

Detailed explanation-2: -When opposite poles of the magnets approach, they attract each other. Any north-south combination will pull them together. But when two like poles come together, they push each other apart.

Detailed explanation-3: -A small magnetic object placed inside the magnetic field will align itself with the magnetic field lines such that the magnetic north pole of the object points along the field line towards the magnetic south pole of the magnet.

Detailed explanation-4: -The magnetic field diverts the spin up atoms in one direction and the spin-down atoms in another direction.