A current exists whenever electric charges move. If delta Q is the net charge that passes through a surface during a time period delta t, then the average current during this time interval is defined
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The current is the rate at which charge flows through this surface. ... area is defined as the current I. ... If ΔQ is the amount of charge that passes through this area in a time interval Δt,
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Everyone does know that the surface of a conductor is at equipotential during equilibrium. I was reading Feynman's lectures where I found this (bold)line: ...
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