A current passes through a wire of non-uniform cross- \( \mathrm{P}...

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A current passes through a wire of non-uniform cross-
\( \mathrm{P} \) section. Which of the following quantities are

W. independent of the cross-section?
(a) the charge crossing in a given time interval
(b) drift speed
(c) current density
(d) free-electron density.
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