PMDC Verified Question 22 of 69
Working principal of magnetic levitation train is according to?
A
Faraday law
B
Max planks law
C
Ohm law
D
Lenz law
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Lenz law
Concept:

Maglev trains utilize induced magnetic fields that actively oppose the train's own magnetic field to create levitation.

Solution:

  • As electromagnets on the train sweep past conductive coils in the track, they induce a current in the track.


  • According to Lenz's Law, this induced track current generates a magnetic field whose polarity strongly repels the train's magnets, causing it to levitate.




Why other options are incorrect:

Ohm's law governs basic circuit resistance. Planck's law relates to quantum body radiation. (Refer to Q.74 for nuance on regional answer key variations).

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.

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.