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The current density in a wire is defined as the current, in milliamperes, flowing through the wire divided by the cross-sectional area of the wire, in square millimeters. What is the current density, in milliamperes per square millimeters, in copper wire with a cross-sectional area of 6 square millimeters when a current of 15 milliamperes flows through the wire?
Sagot :
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