A generator connected to the wheel or hub of a bicycle can be used to power lights or small electronic devices. A typical bicycle generator supplies 6.25 V when the wheels rotate at ? = 22.0 rad/s. a)If the generator's magnetic field has magnitude B = 0.550 T with N = 115 turns, find the loop area A (in m2). b)Find the time interval (in s) between the maximum emf of +6.25 V and the minimum emf of −6.25 V.

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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.