Motors and induced pd extra GCSE questions
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Practice questions
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The motor-effect force (90°) is
Fleming’s left hand: thumb is
If the wire is parallel to the magnetic field, F is
A d.c. motor uses a split-ring commutator to
Common mistakes
- Do not use the right hand for the motor effect (that is the generator / dynamo rule). L is the length in the field, not the whole reel of cable on the bench.
- Turning the coil faster is not a factor in F = BIL for a given I and B - that is the generator story. Do not use the right-hand rule here.
- A steady field and a stationary coil give no induced pd. Do not use the left-hand motor rule to find the induced current direction.
- Do not mix slip rings with the split-ring commutator. An alternator does not give "smooth battery d.c.".
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