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Motional EMF in an Open Conductor

The magnitude...

Question

The magnitude of induced e.m.f. is maximum, when the plane of the armature of a.c. dynamo is:

A

perpendicular to the magnetic lines of force

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B

makes some particular angle θ to the magnetic lines of force

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C

anti- parallel to the magnetic lines of force

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D

parallel to the magnetic lines of force

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Solution

The correct option is D
parallel to the magnetic lines of force

When the plane of the armature is parallel to the lines of force of magnetic field, the rate of change of magnetic flux linked with it is maximum. Therefore, the e.m.f. induced in the armature in this orientation is maximum.

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