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Jan31-13, 05:16 AM
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Positive ions in a metal (except mercury, of course) are not mobile. I imagine that a bowl of mercury would slosh over towards the negative terminal as the positive ions all flowed until the gravitational force limited their movement.

You just made me think. If you could suspend a metal ring and induce a current around it, would there be a measurable force / rotational motion is the direction of the conventional current?