Concept:Faraday's law states that an electromotive force (e.m.f.) is induced in a conductor when there is a change in magnetic flux linked with it.
This change occurs when the conductor cuts across magnetic field lines.
Explanation:According to Faraday's law, the induced e.m.f. depends on the rate at which the conductor cuts magnetic flux.
A conductor merely lying in a magnetic field does not produce an e.m.f. because the flux linked with it remains constant.
Similarly, a conductor lying parallel to the magnetic flux or outside but close to the field does not experience a change in flux.
The essential condition is that the conductor must physically move through the magnetic field and cut the magnetic flux lines.
This cutting action causes an e.m.f. to be induced across the conductor.
Therefore, the correct condition is when the conductor cuts magnetic flux.
Answer:D. cuts magnetic flux.