Question

Explain that Lenz’s law follows the law of conservation of energy.

Answer 1

1. The Hypothetical Scenario (If Induced Current Supported the Change):

1. If the induced current were to attract a magnet moving toward a coil, the magnetic flux would increase automatically without any external force.
2. The magnet would accelerate on its own, gaining kinetic energy.
3. Simultaneously, the coil would produce electrical energy (current). In this case, energy would be created from nothing, which is physically impossible.

2. The Reality (Opposition requires Work): 

1. Because the induced current opposes the motion (e.g., creating a North pole to repel an incoming North pole), an external force must be applied to move the magnet. 
2. The person or machine moving the magnet must perform mechanical work to overcome this repulsion.
3. The mechanical energy spent overcoming this opposition is converted into electrical energy in the coil.

Therefore, Lenz’s law ensures that energy is neither created nor destroyed, but simply converted from one form to another. Thus, the Law of Conservation of Energy is obeyed.