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Unformatted text preview: assignments): a) Change the loop plane orientation with respect to the B field b) Expand or shrink the loop plane area c) Change the B field strength d) Flip or rotate the B field direction e) Move the loop into or out of a uniform B field region The faster the change in flux, the larger is the average induced emf E . The induced current I is then given by Ohms Law , I = E /R, where R is the resistance of the wire loop. Lenzs Law says an induced current will flow in the loop in such a direction (CW or CCW) that it creates a B field of its own to oppose any change in magnetic flux through the loop plane. Therefore use this to find the direction in which the induced current will flow in the loop when the flux in the loop changes . Once you know the direction of I , then it is easy to set the polarity of E if you remember I leaves from the high or + side of E ....
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- Fall '08