The current in a 20.0-mH inductor changes with time as /= 2.00t²-8.00t, where / is in amperes and it is in seconds. (a) Find the magnitude of the induced emf at t = 1.00 s. -80 x How does the emf of an inductor depend on the current? mV (b) Find the magnitude of the induced emf at t = 4.00 s. 160 mv (c) At what time is the emf zero? x Is the current through an inductor zero when the emf is zero? s Need Help? Watch It

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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.