Rejuvenate a weakened magnet by rubbing it against a stronger, more powerful magnet for a few minutes. The stronger magnet partially realigns the electrons of the weaker magnet and restores it to at least some level of i... More » Science Physics Magnetism

A weak magnet becomes stronger when it is rubbed with a strong magnet for several minutes. The strong magnet must be rubbed in only one direction. This procedure does not weaken the stronger magnet. More » Science Physics Magnetism

To make a temporary magnet or electromagnet, students can use an iron core, surround it with copper wire and then pass an electric current through this arrangement to magnetize the nail. When making an electromagnet for ... More » Science Physics Magnetism
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Building a magnetic generator involves inserting a nail through the centers of two cardboard circles so the circles are 1.5 inches apart, insulating the nail between the circles, winding an insulated copper wire on the i... More » Science Physics Magnetism

Permanent magnet generators produce electricity by rotating strong magnets around metal wires. These conductive wires then convey the electricity throughout a residence or industrial complex for decades, because the magn... More » Science Physics Magnetism

The pole strength of each piece when a bar magnet is cut into two equal halves perpendicular to its length is the same as the pole strength of the original bar magnet. However, the magnetic moment of each piece is half t... More » Science Physics Magnetism

A temporary magnet is a magnet that stays magnetized only for a relatively short period of time. Non- electromagnetic temporary magnets tend to be made of soft magnetic materials, like annealed iron or steel. More » Science Physics Magnetism