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A hollow copper wire with an inner diameter of 0.70 mmmm and an outer diameter of...

A hollow copper wire with an inner diameter of 0.70 mmmm and an outer diameter of 2.2 mmmm carries a current of 13 AA .

Part A

What is the current density in the wire?
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Answer #1

Here,

The inner diameter is,

Di= 0.70 mm

Then,

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