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The illustration shows a permanent magnet with pole S and N induces a static magnetic field, which is represented by vertical field lines between the poles from north to south. A rectangular loop is connected to a resistor R through terminal 1 and an a c voltage source V of t of polarity positive to negative. South Pole lies between the terminals 1 and 2, and North Pole lies between the terminals 3 and 4. 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.