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The electromotive force obtained from a simple dynamo may be increased by

The electromotive force obtained from a simple dynamo may be increased by

A. increasing the cross-sectional area of the coil
B. winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
C. increasing the speed of rotation
D. making the field magnet longer
E. using low-resistance copper coils




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