Magnetic force | Middle school physics | Khan Academy
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Permanent magnets and electric currents produce magnetic fields. All magnets, no matter how small, have both a north and south pole. Like poles repel each other, and opposite poles attract each other. The magnetic force is a non-contact force that does not require objects be touching in order to act. Instead, the magnetic force acts through a magnetic field. The strength of the magnetic forces two objects exert on each other depends on the strengths of the magnets, their orientations, and the distance between them.
Sections:
00:00 - Intro
00:23 - Can you separate north and south poles?
01:19 - Magnetic fields
02:50 - Magnetic force direction
03:14 - Strength of the magnetic force
04:28 - Electromagnets
06:33 - Summary
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