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Electromagnets and Induction
Electromagnets and Induction

... Motors with electromagnets  Just as with the magnet you flipped, the electromagnet must switch from north to south as each rotor magnet passes by to keep the rotor turning.  The device that makes this happen is called a commutator. ...
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... Circuit breaker—a reusable safety switch that breaks the circuit when the current is too high. Small metal band heats up, bends away from wires in circuit, disconnecting the circuit—stops the flow of current. To reset the breaker, pull switch back reconnecting the metal band to the circuit. S8Pc Mag ...
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... What is an Electromagnet?  When an electric current is passed through a coil of wire wrapped around a metal core, a very strong magnetic field is produced. This is called an electromagnet.  The more coils wrapped around the core, the stronger the magnetic field that is produced. This stronger mag ...
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Hall effect



The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current. It was discovered by Edwin Hall in 1879.The Hall coefficient is defined as the ratio of the induced electric field to the product of the current density and the applied magnetic field. It is a characteristic of the material from which the conductor is made, since its value depends on the type, number, and properties of the charge carriers that constitute the current.
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