Ignoring complicated electromagnetics, e = df/dt where f is the flux linkages. As you can see now the induced voltage is the rate of change of flux linking with an element. read more
Induced current in any induction process will always be AC, except the Solar cell (PV cell) in which DC voltage is induced, hence DC current. read more
See, current is not only DC or AC type. By AC or DC we are referring whether current changes its phase or not. It is possible to create an induce current without changing the phase of induced current. read more
Lenz's Law Lenz's law states that when an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such, that it produces an current that's magnetic field opposes the change which produces it. read more