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Consider a coil consisting of N turns and carrying current I in the counterclockwise direction, as shown in figure. If the current is steady, then the magnetic flux through the loop will remain constant. However, suppose the current I changes with time, then according to Faraday’s law, an induced e.m.f will arise to oppose the change. The induced current will flow clockwise if Description: 4246.png, and counterclockwise if Description: 4250.png. The property of the loop in which its own magnetic field opposes any change in current is called ‘self-inductance’, and the e.m.f generated is called the self-induced e.m.f or back e.m.f, which we denote as εL.
Description: Description: 582.png
Magnetic flux through the current loop

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