Problem 30.16 A hollow copper wire with an inner diameter of 1.2 mm and an outer

Question

Problem 30.16

A hollow copper wire with an inner diameter of 1.2 mm and an outer diameter of 2.1 mm carries a current of 12 A .

Part A

What is the current density in the wire?

Express your answer to two significant figures and include the appropriate units.

Problem 30.16

A hollow copper wire with an inner diameter of 1.2 mm and an outer diameter of 2.1 mm carries a current of 12 A .

Part A

What is the current density in the wire?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

current density

J = i /A

Area = pi (R22 - R12)

J = i /A = 5144402.201 A/m^2

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