A 12.6-V battery is in series with a resistance of 0.304 Ω and an inductor. (a) After a long time, what is the current in the circuit? I(t = ∞) =  A (b) What is the current after one time constant? I(t = ?) =  A (c) What's the voltage drop across the inductor at this time? ΔVL =  V (d) Find the inductance if the time constant is 0.127 s. L =  H

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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.