Faraday's law of electromagnetic induction states that the induced emf in a circuit is equal to the rate of change of the magnetic field times the number of turns in the circuit. Lenz's law is related to Faraday's law and states that the direction of the induced current will be such that it opposes the change that caused it. In other words, it states that the induced current will always flow in such a way as to oppose the change that caused it.