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

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Question: A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced current as the loop enters the magnetic field? (2023)

Options:

  1. It increases
  2. It decreases
  3. It remains constant
  4. It becomes zero

Correct Answer: It increases

Exam Year: 2023

Solution: 

As the loop enters the magnetic field, the change in magnetic flux increases, leading to an increase in the induced current.

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

Practice Questions

Q1
A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced current as the loop enters the magnetic field? (2023)
  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 magnetic field at a constant speed. What happens to the induced current as the loop enters the magnetic field? (2023)
  • Step 1: Understand that a loop of wire can generate electricity when it moves through a magnetic field.
  • Step 2: Recognize that a magnetic field has lines of force that represent the strength and direction of the magnetic field.
  • Step 3: Know that when the loop of wire enters the magnetic field, it starts to cut through these magnetic lines of force.
  • Step 4: Realize that as the loop moves into the magnetic field, the area of the loop that is within the magnetic field increases.
  • Step 5: Understand that this increase in area leads to a change in magnetic flux, which is the amount of magnetic field passing through the loop.
  • Step 6: Remember that according to Faraday's Law of Electromagnetic Induction, a change in magnetic flux induces an electric current in the wire.
  • Step 7: Conclude that as the loop enters the magnetic field, the change in magnetic flux increases, which results in an increase in the induced current.
  • Electromagnetic Induction – The process by which a changing magnetic field within a closed loop induces an electromotive force (EMF) and consequently a current.
  • 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.
  • Lenz's Law – The direction of induced current is such that it opposes the change in magnetic flux that produced it.
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