Experiment: Drag the loop to the left edge, and then slowly move the loop horizontally to the right edge. Observe the flux as you do this.
A. Is a current produced in the wire?
5 answers
Yes, as the loop is moved horizontally across the magnetic field, a current is induced in the wire due to the changing magnetic flux.
What do you notice about the direction of the current as the wire crosses the midpoint?
As the wire crosses the midpoint, the direction of the induced current changes. Initially, the current flows in one direction, and as the wire continues to move, the current changes direction. This is because the flux is increasing in one direction before reaching the midpoint and then decreasing in the opposite direction after the midpoint, causing a change in the induced current direction.
What causes the direction of the current to change?
The direction of the induced current changes due to the changing magnetic flux experienced by the wire as it moves through the magnetic field. Before crossing the midpoint, the flux is increasing in one direction, inducing a current in a certain direction. After crossing the midpoint, the flux starts decreasing in the opposite direction, causing the current to change direction in response to the changing magnetic field. This phenomenon is described by Faraday's Law of electromagnetic induction.