Magnetic fields are regions around a magnet or a moving electric charge where magnetic forces can be observed. These fields are produced by magnets, electric currents, or changing electric fields. Magnetic field lines show the direction and strength of the field, going from the north to the south pole of a magnet. Magnetic fields exert a force on moving charged particles or current-carrying wires. The direction of the force on a moving charge is perpendicular to both the magnetic field and the charge's velocity, following the right-hand rule. Magnetic fields are used in devices like motors, generators, and MRI machines.
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