The direction of the induced e.m.f. is stated by Lenz's law.

  • Lenz's law states that the direction of the induced e.m.f and hence the direction of induced current in a closed circuit is always such that the magnetic effect always opposes the change producing it.

Lenz's law demonstration


A simulation of Lenz's law ;- http://micro.magnet.fsu.edu/electromag/java/lenzlaw/


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The direction of the induced e.m.f can also be determine by using the Fleming's right hand rule which states that if the thumb and first two fingers of the right hand are held at right angles to each other, where the thumb points in the direction of the motion, the first finger points in the direction of the magnetic field, then the second finger points in the direction of the induced e.m.f and hence in the direction of the induced current in a closed circuit.

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Verify the direction of the induced current with the Fleming Right Hand Rule for the following examples.

FRH1.JPG

FRH2.JPG