Question

Emf around closed path is negative of change in magnetic flux

Answer 1

The most widespread version of Faraday's law states: The electromotive force around a closed path is equal to the negative of thetime rate of change of the magnetic flux enclosed by the path. The closed path here is, in fact, conductive.

Answer 2

Faraday's Principle of Electromagnetic Induction states that the emf induced in a loop due by a changing magnetic flux is equal to the rate of change of the magnetic flux threading the loop. The magnetic flux threading a coil of wire can be changed by moving a bar magnet in and out of the coil.