The magnetic flux through the loop shown in the figure below increases according to the relation ΦB = 6.0t2 + 7.9t, where ΦB is in milliwebers and t is in seconds. (a) What is the magnitude of the emf induced in the loop when t = 3.4 s?  mV (b) What is the direction of the current through R?

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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.