In an A.C. generator, an increase in the number of turns in the coil does which of the following?
Correct answer: A. Increases emf
- A. Increases emf
- B. Decreases emf
- C. Makes the emf zero
- D. Maintains the emf at a constant value
Explanation
Option A is correct since in an A.C. generator, the emf increases as the number of turns in the coil increases because the emf is directly proportional to the number of turns. A.C. generators work based on the principle of Faraday's law.Note: Other factors that influence the induced emf are the strength of the magnetic field, the area of the rotating loop, and the angular velocity of the rotating loop.
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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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