a) Calculate the self-inductance (in mH) of a 54.0 cm long, 10.0 cm diameter solenoid having 1000 loops. b) How much energy (in J) is stored in this inductor when 20.5 A of current flows through it? c) How fast (in s) can it be turned off if the induced emf cannot exceed 3.00 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.