Q.What do you mean by electromagnetic induction? State Faraday's law of induction.

[!TLDR] Electromagnetic induction (EMI) is the production of an emf (and hence current, in a closed circuit) whenever the magnetic flux linked with a circuit changes. Faraday's First Law: a changing flux induces an emf. Faraday's Second Law: $e=-n\frac{d\Phi}{dt}$ for an n-turn coil. [!ANSWER] EMI is the induction of emf by a changing magnetic flux; quantitatively, $e=-n\frac{d\Phi}{dt}$.

Electromagnetic induction is the phenomenon, discovered experimentally by Faraday (and independently by Joseph Henry) in 1831, in which an emf -- and, in a closed circuit, a corresponding current -- is produced whenever the magnetic flux linked with a circuit changes with time. The change can arise in several distinct ways: a magnet moving relative to a stationary coil, a coil moving relative to a stationary magnet, a nearby current-carrying coil's own current changing, or (more generally) any change in the circuit's own area, orientation, or the field strength through it.

Faraday's First Law (qualitative) states: whenever the magnetic flux linked with a closed circuit changes, an emf is induced in it; if a conductor cuts across field lines, an emf is likewise induced between its ends. Faraday's Second Law (quantitative) states that the magnitude of this induced emf equals the rate of change of the linked flux: for a coil of n turns, $e=-n\frac{d\Phi_B}{dt}$, where the minus sign (from Lenz's law) fixes the emf's direction, and in SI units e is in volts while $\Phi$ is in weber. [!ANSWER] EMI is the induction of emf by a changing magnetic flux; quantitatively, $e=-n\frac{d\Phi}{dt}$.

Recall Faraday's experimental observations and state both laws in words and in the equation $e=-n(d\Phi/dt)$.

Stating only the qualitative law and forgetting to give the quantitative relation, or omitting the number of turns n for a multi-turn coil.