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

Answer: (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:

\(\begin{array}{l}\epsilon =-N\frac{\partial\phi _{B} }{\partial t}\end{array} \)


  • 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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