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Quoted from mot:I still can't entirely make sense of this! Why doesn't the direction of the magnetic field matter?
Because the ferrous core (plunger link, etc.) doesn't have a magnetic polarity, it is attracted to either polarity the coil presents.
Quoted from ccotenj:technically speaking, a magnetic polarity is induced in the plunger by the magnetic field... if it had "no polarity" (e.g. electrons still scattered with random polarization, no alignment), it wouldn't work at all... the "attraction" would be offset by the "repelling"... for example, you couldn't use a plastic plunger... the magnetic field can't induce a polarity alignment in plastic, and the orientation remains random, thus the plunger goes nowhere...
see this link:
http://www.solenoid-valve-info.com/solenoid-valve-coil-polarity.html
and read the last 2 paragraphs... they not only explain this, but explain why direction of current doesn't matter...
Of course it wouldn't work with a plunger that is not attracted to a magnetic field, but if that plunger DOES have a significant magnetic polarization to begin with, i.e. it IS a magnet, then the polarization of the current through the coil would matter as it would either attract or repel said magnet based on polarization of the field generated when energized, agreed?
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