The direction of the current induced in a wire moving in a magnetic field is found using which of the following?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Lenz’s law
Faraday’s law gives the size of the induced emf. Lenz’s law gives its polarity. The induced current flows so as to oppose the change in magnetic flux that produces it. So for a wire moving in a magnetic field, Lenz’s law gives the direction of the induced current.
NCERT (2026-27):
Lenz’s Law and Conservation of Energy – “… Lenz’s law which gives the polarity of the induced emf in a clear and concise fashion. The statement of the law is:
The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it.”