The average magnetic field inside a flat coil of area A with N turns around which a current i flows is approximately B=Nu0í/2√A/π. (a) Determine an expression for the flux through the coil when a current i flows. (b) Determine an expression for the coil’s inductance. (c) If the current through a coil of area 45 cm² with 20 turns decreases from 4.0 A to 2.5 A in 0.030s, calculate the induced emf in the coil.

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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.