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EOC_Solution_28_39 - 28.39 Model We assume that the charge...

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28.39. Model: We assume that the charge carriers are uniformly distributed throughout the wire. Solve: Using Equation 28.16, we can write the current density as J I A ne m E = = 2 τ I ne m E A = 2 τ For a given wire, the current is thus proportional to the area through which the current flows:
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