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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Increasing the rotation speed enhances the electromotive force (EMF) generated due to Faraday's law of electromagnetic induction.
Source: Myschool Past Questions Archive (Record #28723)