A magnet is introduced into the coil and a voltage is induced across the coil. Which of the following factor has no effect on the induced votage?
Correct answer: B. The time in which magnet is introduced
- A. Thickness of the wire of the coil
- B. The time in which magnet is introduced
- C. The strength of the magnetic field
- D. Number of turns of the coil
Explanation
The time in which a magnet is introduced into a coil does not affect the induced voltage. The induced voltage in a coil is determined by the rate of change of magnetic flux through the coil, which is influenced by factors such as the strength of the magnetic field, the speed of the magnet's movement, and the number of turns in the coil. The specific time at which the magnet is introduced does not directly impact the induced voltage, as long as the rate of change of magnetic flux remains the same. The induced voltage is a result of how quickly the magnetic flux changes, not the exact moment at which the magnet is introduced.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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