Physics Electromagnetic Induction BUMHS 2024
PMDC Verified Question 14 of 69
The direction of induced e.m.f can be determined by:
A
Faraday's law
B
Lenz's law
C
galvanometer
D
Fleming's right hand rule
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Lenz's law
Concept:

While multiple tools and rules exist, the fundamental physical law that assigns polarity to electromagnetic induction is Lenz's Law.

Solution:

  • Lenz's law explicitly defines the direction of the induced EMF by stating it must oppose the change in flux that created it.


  • Note: Fleming's right-hand rule is a practical mnemonic derived from this law for use in generators, but Lenz's Law is the foundational principle .


Why other options are incorrect:

Faraday's law gives the magnitude, not direction. A galvanometer detects current but is an instrument, not a theoretical determining principle.

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