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Jan 27, 2014 at 4:05 comment added user36094 Nice answer. Indeed in the solid state, we focus on e-e and e-N motions.
Jan 18, 2014 at 0:50 comment added Alan Rominger Giving a counter-example, as you did here, is a good approach. Movement of positive ions do constitute a current in many situations. I had batteries in mind as a counter-example myself, but there are limitless possibilities.
Jan 18, 2014 at 0:27 history edited wonderich CC BY-SA 3.0
e-e, e-N, N-N
Jan 17, 2014 at 23:39 history answered wonderich CC BY-SA 3.0