A loop of wire is moved into a uniform magnetic field at a constant speed. What

Practice Questions

Q1
A loop of wire is moved into a uniform magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  1. It increases
  2. It decreases
  3. It remains constant
  4. It becomes zero

Questions & Step-by-Step Solutions

A loop of wire is moved into a uniform magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  • Step 1: Understand that a loop of wire is being moved into a magnetic field.
  • Step 2: Recognize that the magnetic field is uniform, meaning it has the same strength and direction throughout.
  • Step 3: Know that when the loop enters the magnetic field, more of the loop's area is exposed to the magnetic field.
  • Step 4: Remember that the induced EMF (electromotive force) is related to the change in magnetic flux through the loop.
  • Step 5: As the area of the loop in the magnetic field increases, the magnetic flux through the loop also increases.
  • Step 6: Since the magnetic flux is increasing, the induced EMF will also increase.
  • Electromagnetic Induction – The process by which a changing magnetic field within a closed loop induces an electromotive force (EMF) in the wire.
  • Faraday's Law of Induction – The induced EMF in a circuit is directly proportional to the rate of change of magnetic flux through the circuit.
  • Magnetic Flux – The product of the magnetic field strength and the area through which it acts, which changes as the loop enters the magnetic field.
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