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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: currents, the one positive and the other negative, in two opposite
directions through the wire. The presence of these currents evokes
a force of repulsion between the magnet and the wire; and to cause
the one to approach the other, this repulsion must be overcome.
The overcoming of this repulsion is, in fact, the work done in
separating and impelling the two electricities. When the wire is
moved away from the magnet, a Scheidungs-Kraft, or separating force,
also comes into play; but now it is an attraction that has to be
surmounted. In surmounting it, currents are developed in directions
opposed to the former; positive takes the place of negative, and
negative the place of positive; the overcoming of the attraction
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