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The illustration depicts a permanent magnet with pole S and N induces a static magnetic field which is indicated by vertical field lines between the poles from North to south. A rectangular loop is connected to a resistor R through terminal 1. South Pole lies between the terminals 1 and 2, and North Pole lies between the terminals 3 and 4 of the loop. The conducting loop is made to rotate via an external force and develops a motional e m f V sub EMF sup m with polarity positive to negative. A current I passes in the opposite directions through the segments 1-2 and 3-4. It revolves the conducting loop clockwise with an angular velocity omega about its axis.