Question

During electromagnetic induction, the direction of induced e.m.f. is given by

• A. Faraday’s law
• B. Lenz’s law
• C. Maxwell’s law
• D. Ampere’s law

Answer 1

The correct option is B

Lenz’s law

1. According to Lenz's law of electromagnetic induction, the direction of induced current or emf in a given magnetic field is such that it opposes the induced change by modifying the magnetic field.
2. Induced emf is represented by $\mathrm{e}=–\mathrm{N}(\mathrm{d\Phi }/\mathrm{dt})$ where $\varphi$ is the change in magnetic flux and $\mathrm{N}$ is the number of turns in the coil.
3. The direction of the induced current is determined using Lenz's law.

Hence, option B is the correct answer.