NEET 2009 Physics question
A rectangular, a square, a circular and an elliptical loop, all in the plane, are moving out of a uniform magnetic field with a constant velocity, . The magnetic field is directed along the negative z axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for:
Answer: (1)
Solution
Motional emf , where is the length of the loop edge that lies in the field and is cutting the field boundary (the length perpendicular to the velocity). For the rectangular and the square loop (sides parallel to the axes) the length of conductor cutting the field edge is a fixed side while
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