State Faraday's second law of electromagnetic induction.

(N/A) Faraday's second law of electromagnetic induction states that the magnitude of the induced electromotive force $(emf)$ in a circuit is directly proportional to the rate of change of magnetic flux linked with the circuit.
Mathematically,it is expressed as $\varepsilon = -\frac{d\Phi_B}{dt}$,where $\varepsilon$ is the induced $emf$ and $\frac{d\Phi_B}{dt}$ is the rate of change of magnetic flux.