Now these lines may be intersected close to the magnet or at a
distance from it. Faraday finds distance to be perfectly immaterial
so long as the number of lines intersected is the same.
For example, when the loop connecting the equator and the pole of
his barmagnet performs one complete revolution round the magnet,
it is manifest that all the lines of force issuing from the magnet
are once intersected. Now it matters not whether the loop be ten feet
or ten inches in length, it matters not how it may be twisted and
contorted, it matters not how near to the magnet or how distant from
it the loop may be, one revolution always produces the same amount
of current electricity, because in all these cases all the lines of
force issuing from the magnet are once intersected and no more.

From the external portion of the circuit he passes in idea to the
internal, and follows the lines of force into the body of the magnet
itself. His conclusion is that there exist lines of force within
the magnet of the same nature as those without. What is more, they
are exactly equal in amount to those without. They have a relation
in direction to those without; and in fact are continuations of
them.... 'Every line of force, therefore, at whatever distance it
may be taken from the magnet, must be considered as a closed
circuit, passing in some part of its course through the magnet,
and having an equal amount of force in every part of its course.'

All the results here described were obtained with moving metals.
'But,' he continues with profound sagacity, 'mere motion would not
generate a relation, which had not a foundation in the existence of
some previous state; and therefore the quiescent metals must be in
some relation to the active centre of force,' that is to the magnet.
He here touches the core of the whole question, and when we can