Correct Answer - Option 2 : Lenz's law
CONCEPT:
Lenz's Law:
- According to this law, the emf will be induced in a coil due to a changing magnetic flux in such a way that it will oppose the cause which has produced it.
- This law states that the induced emf in a conductor due to a changing magnetic flux is such that the magnetic field created by the induced emf opposes the change in a magnetic field.
\(\Rightarrow emf=-N\left ( \frac{d\phi}{dt} \right )\)
where N = number of loops and dϕ = Change in magnetic flux
- The above equation is given by Faraday's law, but the negative sign is a result of Lenz's law.
EXPLANATION:
- The Lenz law states that the induced emf in a conductor due to a changing magnetic flux is such that the magnetic field created by the induced emf opposes the change in a magnetic field.
- So the direction of induced emf during electromagnetic induction is given by Lenz's law. Hence, option 2 is correct.
