For the wire in $($Figure $1),$ whose diameter varies uniformly from $a$ to $b$ as shown, suppose a current $I=10$A enters at $a.$

If $a=15mm$ and $b=50mm,$ what is the current density $($assume uniform$)$ at each end?

Express your answer in amperes per square meter.

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Figure

$1$ of $1$

Part B

Express your answer in amperes per square meter.

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