An aluminum ring of radius 5 cm and resistance 10.0 10-4 (around the circumference of the ring) is placed on top of a long air-core solenoid with 999 turns per meter and radius 4 cm, as in Figure P20.62. Assume that the axial component of the magnetic field at the end of (but inside) the solenoid drops to half its value at the center and drops abruptly to zero outside the solenoid. If the current in the solenoid is increasing at a constant rate of 265 A/s, what is the induced current in the ring? ____ A At what rate is heat generated in the ring? ____ mW Figure P20.62

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Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.