A coil with 200 windings and a surface area of 2,8 × 10-3 m is rotated at constant speed in a constant magnetic field of 2,5 T. An emf of 3,5 V is induced in the coil.
9.1 Consider the following statement: The magnitude of the induced emf across the ends of a conductor is directly proportional to the rate of change in the magnetic flux linkage with the conductor.
Name the law represented by the above statement. (1)
9.2 Calculate the:
9.2.1 Change in magnetic flux if the angle of the coil relative to the magnetic field changes from 0° to 90° (3)
9.2.2 Time it takes the coil to rotate from 0° to 90° (3)
9.3 By what factor will the induced emf change if a coil with 100 windings is used under the same conditions? Give a reason for the answer. (2)
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