Question

magnetic force can be externally on a certain substances what are the substances​

Answer 1

These substances are weakly magnetized in an external magnetic field. The direction is the same direction of the magnetic field. ... Thus paramagnetic substances are not permanent magnets. Paramagnetism is due to at least one pair of unpaired electrons in its orbit shell which get magnetized in the magnetic field.

Answer 2

All matter exhibits magnetic properties when placed in an external magnetic field. Even substances like copper and aluminum that are not normally thought of as having magnetic properties are affected by the presence of a magnetic field such as that produced by either pole of a bar magnet.