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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: in the earth under the wire; these currents would run against the
same terminal plate, and thus neutralise each other.
This inference appears inevitable, but his profound vision perceived
its possible invalidity. He saw that it was at least possible that
the difference of conducting power between the earth and the wire
might give one an advantage over the other, and that thus a residual
or differential current might be obtained. He combined wires of
different materials, and caused them to act in opposition to each
other, but found the combination ineffectual. The more copious flow
in the better conductor was exactly counterbalanced by the
resistance of the worse. Still, though experiment was thus emphatic,
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