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A circular loop of wire is placed in a uniform magnetic field. What happens to t

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Question: A circular loop of wire is placed in a uniform magnetic field. What happens to the induced EMF if the magnetic field strength is doubled?

Options:

  1. Induced EMF is halved
  2. Induced EMF remains the same
  3. Induced EMF is doubled
  4. Induced EMF is quadrupled

Correct Answer: Induced EMF is doubled

Solution: 

According to Faraday\'s law of electromagnetic induction, the induced EMF is directly proportional to the rate of change of magnetic flux. If the magnetic field strength is doubled, the induced EMF will also double.

A circular loop of wire is placed in a uniform magnetic field. What happens to t

Practice Questions

Q1
A circular loop of wire is placed in a uniform magnetic field. What happens to the induced EMF if the magnetic field strength is doubled?
  1. Induced EMF is halved
  2. Induced EMF remains the same
  3. Induced EMF is doubled
  4. Induced EMF is quadrupled

Questions & Step-by-Step Solutions

A circular loop of wire is placed in a uniform magnetic field. What happens to the induced EMF if the magnetic field strength is doubled?
  • Step 1: Understand that a circular loop of wire is placed in a magnetic field.
  • Step 2: Know that the magnetic field strength is a measure of how strong the magnetic field is.
  • Step 3: Learn about Faraday's law, which states that the induced EMF (electromotive force) in a loop is related to the change in magnetic flux through the loop.
  • Step 4: Recognize that magnetic flux depends on the strength of the magnetic field and the area of the loop.
  • Step 5: If the magnetic field strength is doubled, the magnetic flux through the loop also doubles.
  • Step 6: Since the induced EMF is directly proportional to the change in magnetic flux, if the magnetic field strength doubles, the induced EMF will also double.
  • Faraday's Law of Electromagnetic Induction – The induced EMF in a circuit is proportional to the rate of change of magnetic flux through the circuit.
  • Magnetic Flux – Magnetic flux is the product of the magnetic field strength and the area through which it passes, taking into account the angle between the field lines and the normal to the surface.
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