Figure a indicates a simple version of an alternator, a device that generates an emf. We rotate a rectangular loop with angular speed ω about the indicated axis. The magnetic field B is uniform and constant. At time t = 0, Θ= 0. What is the emf induced as a function of time for a complete turn of the alternator. Represent this information in the form of a graph.

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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.