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27. Resistors & DC Circuits - Part 1 of 2
27. Resistors & DC Circuits / Intro to Current / Problem 3

A high-speed train operates with a power supply system that utilizes overhead wires for electrical transmission. The overhead wire has an outer diameter of 4 cm and an inner diameter of 3 cm. The wire carries a current of 1000 A. Calculate the current density in the wire.

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