Electric OU: Supplement: Right Hand Rule? Whaaat?

Electromagnet field polarity depends on coil winding sense, CW or CCW. The Right Hand Rule: point your thumb in the direction of the current, and your fingers curl around the wire in the direction of the magnetic field produced around the wire by the current. Now follow the wire around the solenoid turns with your pointing thumb. See how the fingers curl? Solenoid turns in the CW sense cause the fingers curling UP to be OUTside the coil; solenoid turns in the CCW sense cause the fingers curling UP to be INside the coil. Hence the total coil’s field polarity is determined by the winding sense, all other factors remaining constant.

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