Question Detail
Question
In the motional EMF example (Slide 20), if the loop is moving to the right, causing a decrease in the inward magnetic flux, what is the direction of the induced current in the loop, according to Lenz's law?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Slide 20 explains: 'Lenz's law: there is less inward flux through the loop. Hence the induced current gives inward flux. ⇒ So the induced current is clockwise.' To counteract the decrease in inward flux, the induced current must create its own inward flux, which is achieved by a clockwise current.
Hint
If inward flux is decreasing, the induced current must create a magnetic field that is also inward to oppose this change. Use the right-hand rule for the direction of current in a loop to produce an inward field.