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Helically wound wire creates a solenoid. The magnetic field strength in a solenoid is proportional to the current I, number of turns N and the length l of the solenoid.

solenoid_with_length_l.png

You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial, and with any modifications (the permission is hereby given, so there is no need to ask for it explicitly again), but you MUST always give the following credits:

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0


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