Explica brevemente, pero con claridad, las semejanzas y diferencias entre: a) Un imán natural y otro artificial. b) Un imán temporal y otro permanente

natural magnet is a material where the magnetic domains are aligned in a specific direction

An artificial magnet is a material that is placed in a strong external magnetic field, which causes the magnetic pick-ups of the spins to line up, thus creating a magnetic field in the direction of the external field,

Explanation:

A natural magnet is a material where the magnetic domains are aligned in a specific direction therefore creating a magnetic field in that direction.

An artificial magnet is a material that is placed in a strong external magnetic field, which causes the magnetic pick-ups of the spins to line up, thus creating a magnetic field in the direction of the external field, when the external field turns off the Material slowly returns to the random (paramagnetic) state in a given time as it detaches from the interaction of the material's spins.

A permanent magnet is a magnet where the spies are aligned in the molecules and therefore the Ferromagnetic state is maintained over time.

In a temporary magnet the state of lowest energy is paramagnetic and therefore the spins go into this disordered state to decrease the internal energy and the magnet disappears at the source of the relaxation time of the spins.

b would be the answer

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.