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)
It increases
It decreases
It remains constant
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.
