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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: Society, December 31, 1851, is 'on the employment of the Induced
Magnetoelectro Current as a test and measure of magnetic forces.'
He forms rectangles and rings, and by ingenious and simple devices
collects the opposed currents which are developed in them by
rotation across the terrestrial lines of magnetic force. He varies
the shapes of his rectangles while preserving their areas constant,
and finds that the constant area produces always the same amount of
current per revolution. The current depends solely on the number of
lines of force intersected, and when this number is kept constant
the current remains constant too. Thus the lines of magnetic force
are continually before his eyes, by their aid he colligates his
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