A generator connected to the wheel or hub of a bicycle canbe used to power lights or small electronic devices. A typicalbicycle generator supplies 6.00 V when the wheels rotate atω = 20.0 rad/s. (a) If the generator’s magnetic field has magnitudeB = 0.600 T with N = 100 turns, find the loop area A. (b)Find the time interval between the maximum emf of +6.00 Vand the minimum emf of -6.00 V.

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.