The maximum safe current in a copper wire with a diameter of 3.0 mm is about 20
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The maximum safe current in a copper wire with a diameter of 3.0 mm is about 20 amperes. In an STM, a current of 1.0 × 10−9 A passes from the tip to the surface in a filament of diameter ~1.0 nm. Compare the current density in the copper wire with that in the STM.
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Siva prasad gulla
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