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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: encountering any sensible resistance. It resembles the motion of a
conductor in the unexcited field of an electro-magnet. Now, let us
suppose a body placed in the liquid, or acting on it, which confers
upon it the property of viscosity; the hand would no longer move
freely. During its motion, but then only, resistance would be
encountered and overcome. Here we have rudely represented the case
of the excited magnetic field, and the result in both cases would be
substantially the same. In both cases heat would, in the end, be
generated outside of the muscle, its amount being exactly equivalent
to the resistance overcome.
Let us push the analogy a little further; suppose in the case of the
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