Which of the following law's gives the direction of induced emf?

A) Lenz’s law
B) FLeming’s left-hand rule
C) Ohm’s law
D) Faraday’s law of electromagnetic induction

The correct option is A) Lenz’s law.

Lenz’s law is used for determining the direction of induced current.

Lenz’s law of electromagnetic induction states that the direction of induced current in a given magnetic field is such that it opposes the induced change by changing the magnetic field.

Following is the formula of Lenz’s law:

\(\epsilon =-N\frac{\partial\phi _{B} }{\partial t}\)


  • ε is the induced emf
  • ∂ΦB is the change in magnetic flux
  • N is the number of turns in the coil

Lenz’s law finds application in electromagnetic braking and in electric generators

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