Motional emf can be produced with:
Correct answer: B. Changing magnetic field in time
- A. Changing magnetic field in space
- B. Changing magnetic field in time
- C. Changing flux with space
- D. Constant magnetic field
Explanation
Motional emf is produced when a current-carrying conductor is moved in an external magnetic field. The motional emf will be greater if the conductor is moved fast. The change in magnetic flux in unit time is equal to the induced emf. Therefore the correct option will be changing magnetic fields in time.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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