Magnetic field lines are visual representations of magnetic fields, illustrating the direction and strength of the magnetic force around a magnet or an electric current. These lines emerge from the north pole of a magnet, curve through space, and return to the south pole, indicating the path a magnetic force would take. The density of these lines is proportional to the strength of the magnetic field, helping to understand how magnetic forces interact with charged particles in various contexts, especially in the study of magnetohydrodynamics.
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