This exhibit illustrates Lenz’s Law.
By putting a current through an aluminum ring, a magnetic field is created. But because the new magnetic field opposes the primary field, represented with the ring, this is flipped into the air.
What is the connection between the direction of the current and the flux in an electromagnet? Lenz’s law proves that If we move a magnet towards a loop, the field due to the induced current in the loop exerts a force that opposes the motion of the magnet. The loop sets up a magnetic field similar to that of a magnet with its north pole pointing towards the north pole of the magnet, and the two north poles repel each other. Therefore we must exert a greater force in order to continue pushing the magnet towards the loop.
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