Lenz's law is a consequence of the law of conservation of which physical quantity?

Solution

1. Lenz's law states that the direction of an induced current always opposes the change in magnetic flux that created it.
2. If the induced current were to assist the change, it would create a self-reinforcing system that generates energy without work, violating physical laws.
3. Instead, external work must be performed to overcome this opposition, and that work is converted into electrical energy.
4. This process confirms that Lenz's law is a direct application of the law of conservation of energy.
5. Hence the answer is (B).