in which of the following devices does a changing magnetic field produce an electric current?\na. electric…
in which of the following devices does a changing magnetic field produce an electric current?\na. electric motor\nb. transformer\nc. generator\nd. battery
Answer
Brief Explanations:
- An electric motor uses electric current to create motion via magnetic fields, not the reverse.
- A transformer relies on electromagnetic induction: a changing magnetic field in its primary coil induces an electric current in the secondary coil.
- A generator uses mechanical motion to create a changing magnetic field that produces current, but the core mechanism of a transformer is directly based on a changing magnetic field inducing current between its coils.
- A battery produces current via chemical reactions, not magnetic fields.
Answer:
B. Transformer, C. Generator