Electricity and Magnetism - SS2 Physics Past Questions and Answers - page 5
Faraday's law of electromagnetic induction states that the magnitude of the induced EMF is proportional to:
The number of turns in the coil
The cross-sectional area of the coil
The time the magnetic field is present
The angle between the magnetic field and the coil
Lenz's law is a consequence of Faraday's law and states that the induced current in a conductor always flows in a direction that:
Enhances the original magnetic field
Opposes the original magnetic field
Is perpendicular to the original magnetic field
Does not depend on the original magnetic field
A magnetic field is changing at a rate of 0.2 T/s. If the number of turns in a coil is 100 and the area of the coil is 0.05 m², what is the magnitude of the induced EMF in the coil?
A circular loop of radius 0.1 m is placed in a uniform magnetic field of 0.5 T. If the loop is rotated from a position where the magnetic field lines are perpendicular to the plane of the loop to a position where the magnetic field lines are parallel to the plane of the loop in 0.2 s, what is the average induced EMF in the loop?
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