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5/31 MCQs for:
Electromagnetism
A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is:
As the frequency of the AC voltage across an inductor approaches zero, the inductive reactance of that coil:
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 induced emf is to be zero?
The power factor of an RLC circuit is defined as cos? = R/Z, but the phase angle can also be calculated from :
A flux of 4.0 ? 10-5 Wb is maintained through a coil for 0.50 s. What emf is induced in this coil by this flux?