Lens Law
Electricity and Magnetism
Level
2
The bar magnet shown in the figure above is
moved completely through the loop. Which
of the following is a true statement about the
direction of the current flow between the two
points a and b in the circuit?
Current flows from b to a as the magnet passes through the loop.
Current flows from a to b as the magnet passes through the loop.
Current flows a to b as the magnet enters the loop and from b to a as the magnet leaves the loop.
Current flows b to a as the magnet enters the loop and from a to b as the magnet leaves the loop.
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1 solution
According to Lenz's law, the current will flow through the loop such a way that it can maximally oppose the change happening. So for this in the front side of the viewer there a south pole will be created virtually and in the other side closer to the magnet north pole will be created. As we can see if current flows through the loop in anti clockwise direction this configuration of magnet will be formed, we can say the current will flow through b to a.