An electric motor could be used as a: ___________?
Correct answer: C. Dynamo
- A. Battery
- B. Capacitor
- C. Dynamo
- D. Transformer
Explanation
An electric motor and a dynamo are reversible electromagnetic machines: a motor converts electrical energy into mechanical energy, while a dynamo converts mechanical energy into electrical energy. The likely trap is transformer, which changes AC voltage but does not normally convert electrical energy into mechanical rotation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Faraday's Law questions
A straight conductor of length 0.5 m moves at 4 m per second perpendicular to a field of 0.2 T. The emf induced across its ends is
Which change would NOT increase the emf induced in a coil by a moving magnet?
In an alternating current generator, the emf induced in the rotating coil is maximum when the plane of the coil is
The back emf of a motor which is just started is_________?
An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?