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Polaritity
That's the grip rule. Position for fingers and thumb so it looks like you're giving someone the thumbs up, and then rotate your hand so your curved fingers are in-line with the curved wire, and the tips are pointing in the direction of the current.
Then your thumb points in the direction of the north (which i find to be right).
Then your thumb points in the direction of the north (which i find to be right).
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