Concept:Eddy currents are induced loops of current that appear in conductors when the magnetic flux through them changes.Explanation:A galvanometer uses eddy currents to damp the oscillation of its coil.A speedometer uses eddy currents to produce a braking torque that moves the needle smoothly.An induction furnace uses eddy currents to generate heat inside the metal charge.An induction coil is a device that converts a low direct current voltage into a high alternating voltage.It relies on electromagnetic induction between two coils, not on eddy currents.Answer:D. induction coil.