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The loop is connected to two slip rings along with brushes and a bulb. The slip rings rotate about the x axis with an angular speed, omega. A motional EMF V sub EMF sup m is induced across the terminals 1 and 4. The length of the rectangular loop along the terminals 1 and 2 is l and width, w is along the terminals 2 and 3. A differential length vector DL is pointing from terminal 2 to 1. A uniform magnetic field B travels from bottom to top. A unit vector n caret represents loop surface normal, is in the y z plane and forms an angle alpha with the z axis.