MI: Magnetic Inductance
Electromotive force (EMF), Induced Currents
Faraday and Lenz's Law
Practicing Lenz’s law and finding the direction of the induced current in a rectangular loop
A single-turn rectangular loop of width W and length L moves parallel to its length with a speed v. The loop moves from a region with a magnetic field perpendicular to the plane of the loop to a region where the magnetic field is zero, as shown in the figure. Find the rate of change in the magnetic flux through the loop in the following moments:
a) Before it enters the region of zero magnetic fields,
b) Just after it enters the region of zero magnetic fields,
c) Once it is entirely within the region of zero fields,
d) For each case considered in parts (a), (b), and (c), state whether an electric current is induced in the loop or not.
e) For each case considered in part (d), find the direction of the induced current (clockwise, counterclockwise, or zero). Explain your reasoning in a sentence or two.