Physics Electromagnetic Induction SZABMU 2024
PMDC Verified Question 4 of 69
The Lenz's law of electromagnetic induction is in accordance with law of conservation of ____
A
Charge
B
Energy
C
Mass
D
Momentum
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Energy
Concept:

Lenz's law states that an induced EMF always gives rise to a current whose magnetic field opposes the original change in flux.

Solution:

  • This opposing magnetic force acts as a brake. To keep the generator moving or the flux changing, external mechanical work must be done against this resistance.


  • This mechanical work is strictly what gets converted into electrical energy, proving that Lenz's law is a direct consequence of the law of conservation of energy.


Why other options are incorrect:

Conservation of charge relates to Kirchhoff's current laws. Mass and momentum are conserved in mechanical collisions, but energy is the core principle governing the work-to-electricity conversion in induction.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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