The figure below shows three situations of conducting loops in magnetic fields.
ID: 1287299 • Letter: T
Question
The figure below shows three situations of conducting loops in magnetic fields. The loop is in the plane of the paper and the direction of the magnetic field is given by the direction of the arrows. The arrangements change from the initial-state (i) to the final-state (f) for each diagram. Select True or False for all statements. In diagram A, while changing from (i) to (f), a counterclockwise current is induced in the loop. In diagram B, while changing from (i) to (f), a counterclockwise current is induced in the loop. In diagram C, while changing from (i) to (f), a clockwise current is induced in the loop.Explanation / Answer
All three are false
Explaination ::
Lenz law : An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux.
1) here magnetic field inside the coil in decresing so B inside the plane of the paper has to be increased for that current has to clockwise in the coil
2) similar situation as the B inside the plane of the paper which dissappears so the it has to increase.....so it produces clockwise current
3) here initially there was no flux and finally also there is no flux. so change in flux is zero==> induced current = 0