Currents produce magnetic fields, and magnetic fields exert forces on currents. When a current flows through a
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Currents produce magnetic fields, and magnetic fields exert forces on currents. When a current flows through a wire, does the magnetic field it produces act to make the wire expand or contract? What about the force on the wires in a solenoid? Does it act to make the solenoid expand or contract? These are significant effects for wires carrying very large currents.
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