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# What is the resistance of a 4.9-m length of copper wire 1.5 mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m.?

A). What is the resistance of a 4.9-m length of copper wire 1.5 mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m.

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- KnrLv 42 months ago
resistance R = resistivity x length / area of cross-section

ie., R = 1.68x10’-8x 4.9 / 3.14x 75x75x10’-10

= 0.047 ohm.

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