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CHAPTER 26 Electric Current and Direct-Current Circuits 1* In our study of electrostatics, we concluded that there is no electric field within a conductor in electrostatic equilibrium. How is it that we can now discuss electric fields inside a conductor? When a current flows, the charges are not in equilibrium. In that case, the electric field provides the force needed for the charge flow. 2 A physics professor has assembled his class at the baggage-claim carousel of the local airport to demonstrate an analog of electrical current. Think of each suitcase on the conveyor belt as a package of electrons carrying one coulomb of charge, he says. Counting and timing the suitcases reveals that the conveyor belt represents a wire carrying a constant 2-A current (constant as long as annoyed travellers could be kept away from their baggage by some of the huskier students). ( a ) How many suitcases will go by a given point in 5.0 min? ( b ) How many electrons does that represent?

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