25. The switch in Figure P32.25 is open for t<0 and is then thrown closed at time t = 0. Assume R= 4.00 n, L= 1.00 H, and Ɛ = 10.0 V. Find (a) the current in the inductor and (b) the current in the switch as functions of time thereafter. R 2R R ll

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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.