A student moves a magnet into a coil, as shown. The voltmeter measures the magnitude of the electromotive force (e.m.f.) induced in the coil.
Which quantity does not affect the magnitude of the induced e.m.f.?

1 )
the number of turns per unit length in the coil
the polarity of the magnet
3 )
the speed of the magnet
4 )
the strength of the magnet
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