First slide
Lenz's law and conservation of energy
Question

Two circular, and similar coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?

Moderate
Solution

When the loops are brought nearer, magnetic flux linked with each loop increases. Thus the current will be induced in each loop in a direction opposite to its own current in order to oppose increase in magnetic flux. This is in accordance with Lenz's law. So, the current will decrease in each loop.

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