Question

identifying how to induce current
you are trying to induce a current and have put together the setup shown. what needs to be added in order for current to flow in the wire?
direction of movement of wire
a wire coil
an iron bar
a magnet

Explanation:

Electromagnetic induction requires a magnetic field. A wire coil and an iron bar alone do not provide the necessary magnetic field for current induction. A magnet, however, provides the magnetic field. When the wire moves through this magnetic field (as per electromagnetic induction principles), a current is induced in the wire.

Answer:

a magnet