An 3.5 H inductor is connected in series to a 18 V battery, a resistor, and a switch which has been open for a long time. If the current through the inductor takes 4.6 s to reach 55 percent of its final value, what is the resistance? (in Ω) (a) 0.76 Ω

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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.