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The cylindrical surface of plastic cylinder, 20.0 m long and 2.80 cm in diameter is coated...

The cylindrical surface of plastic cylinder, 20.0 m long and 2.80 cm in diameter is coated on the outside with a uniform layer of gold, 0.09 mm thick. A voltage source of 12 V is applied across the flat ends. ρgold = 2.44 × 10−8 Ω · m.

c. What is the current density?

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