Evan's Space

Wonders of Physics


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DC motor and AC generator (revised)

The purpose of the split ring commutator and slip rings are updated here.

DC motor and AC generator small

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Induced emf not affected by resistance of wire

The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon

A) the length of the conductor.
B) the resistance of the conductor.
C) the speed of the conductor.
D) the strength of the magnetic field.

Solutions: B

The longer the wire, the rate in which the magnetic lines of force cutting the wire is greater. So A is true.

As it is a wire and not a closed circuit, no induced current is formed. Hence induced emf is produced and the resistance of the wire will not affect the in emf induced.