Question: Consider a strip of material that has a rectangular crosssection with height (310 mu mathrm{m}) and width (4.2 mathrm{~mm}) and which carries a uniform current

Consider a strip of material that has a rectangular crosssection with height $310 \mu \mathrm{m}$ and width $4.2 \mathrm{~mm}$ and which carries a uniform current of $5.5 \mathrm{~mA}$.

(a) What is the current density in the strip?

(b) If the number density of the charge carrier (conduction electron) is $3.5 \times 10^{23} \mathrm{~m}^{-3}$, then calculate the drift speed in the strip.

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