MHT CET202519 Apr 2025Evening ShiftPhysicsElectromagnetic InductionActual
Out of the following which law obeys the law of conservation of energy?
Options
- AKirchhoff's 1^ st law in electricity.
- BLenz's law in induction.
- CAmpere's circuital law.
- DGauss's law is electrostatics.
Correct answer
B. Lenz's law in induction.
Step-by-step solution
Lenz's law provides a direct application of energy conservation in electromagnetic induction. When magnetic flux through a circuit changes, the induced EMF generates a current whose magnetic field opposes the original flux change. This opposition prevents energy from being created or destroyed without external work. E = - d _B dt If the induced current reinforced rather than opposed the flux change, it would create a self-amplifying effect violating energy conservation. The negative sign in Faraday's law formulatio