n 1831, Michael Faraday was the first to realize that an electric current could be
induced by passing a magnet through a coil of copper wire. Which factor is MOST
essential for the induction of the electric current?
a. The use of strong magnets for the
process
c. The use of magnetic material to
make the coil
b. The use of very long coils for the
process
d. The movement of the magnet
relative to the coil of wire.