Physics Electromagnetic Induction KU 2024
PMDC Verified Question 6 of 69
The direction of induced current is determined by?
A
Ampere's law
B
Faraday's law
C
Lenz's law
D
Ohm's law
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

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

While Faraday's law determines the magnitude of the induced EMF, a separate principle governs its polarity (direction).

Solution:

  • Lenz's law states that the direction of the induced current is such that its own magnetic field will oppose the change in magnetic flux that caused it.


  • This is mathematically represented by the negative sign in Faraday's equation (\( \varepsilon = -N \frac{\Delta \phi}{\Delta t} \)).


Why other options are incorrect:

Faraday's law gives the magnitude. Ampere's law relates current to the magnetic field it produces (not induction). Ohm's law relates voltage, current, and resistance in a circuit.

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