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Faraday's Law This is arguably the most
famous of his discoveries and it was made by using an
induction coil made by wrapping 2 wires around a
wooden bobbin side by side but insulated from each
other. The primary wire had a switchable connection to
a battery. The secondary wire was connected to a
galvanometer, which is sensitive ammeter used to
detect electric fields. Once he increased the length
of the wires he noticed deflection in the ammeter when
the circuit of the primary wire was made and broken.
He had just discovered the electromotive force created
by electromagnetic induction. Faraday observed that
when he passed a magnet through a coil of wire that a
voltage would be "induced" in the coil. Further
investigations showed no matter how the change in the
magnetic field relative to the coil was
performed the voltage was produced.
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