To induce an emf in a coil, the linking magnetic flux
Correct answer: D. can either increase or decrease
- A. must decrease
- B. must remain constant
- C. must increase
- D. can either increase or decrease
Explanation
D is the correct answer.According to Faraday's law of electromagnetic induction, an emf is induced in a coil when there is a change in the magnetic flux linking the coil. This change can be achieved by either increasing or decreasing the magnetic flux. However, to induce an emf in the coil, the magnetic flux must change, which means it must decrease, increase, or fluctuate over 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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