A circular loop of wire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induce emf is zero? Explain
a. any horizontal orientation will do
b. it must be vertical
c. it must make an angle 45 degrees to the vertical
d. none of these answers
Answers: 2
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