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The circuit diagram shows a circular stationary loop with contour C, and surface area S is attached to the opposite polarities terminals 1 and 2, and a resistor R. The loop is exposed to a changing magnetic field B of t that generates a transformer e m f V sub e m f sup t r. A current is flowing in the clockwise direction that induces a magnetic field B sub i n d pointing downward through S. The direction of the contour C is in the opposite direction of the current.