In the past few days, we have investigated the creation of magnetic fields by current distributions. Thus we might say that an electric field can be used to create a magnetic field. Nested solenoids, power supply, and projection ammeter. Careful experiment would show that the current induced in the outer solenoid is proportional to the rate at which the magnetic flux linking the turns of the solenoid changes . The magnitude of the emf induced about a closed loop is proportional to the rate at which the magnetic flux through that loop changes with time.
Induced current is set up in a closed conducting loop by an induced emf.
This emf is induced by the change of the magnetic flux through the loop. The induced emf appears only when the number of lines of B through loop are changing. A bounded by a closed loop. Note that no additional proportionality constant is needed in Faraday's law when SI units are used consistently. An induced current has a direction such that the magnetic field due to the induced current opposes the change in the magnetic flux that induces the current.