Part A

For the wire in $($Figure $1),$ whose diameter varies uniformly from $a$ to $b$ as shown, suppose a current $I=1\mathrm{.}0$A enters at $a.$

Figure

$1$ of $1$

If $a=1\mathrm{.}5mm$ and $b=5\mathrm{.}0mm,$ what is the current density $($assume uniform$)$ at each end?

Express your answer in amperes per square meter.

$j_a=,\frac{A}{m^2}$

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Part B

Express your answer in amperes per square meter.

$j_b=$

$\frac{A}{m^2}$

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