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A 23.0 −m -long cable consists of a solid-inner, cylindrical, nickel core 11.0 cm in diameter...

A 23.0 −m -long cable consists of a solid-inner, cylindrical, nickel core 11.0 cm in diameter surrounded by a solid-outer cylindrical shell of copper 11.0 cm in inside diameter and 22.0 cm in outside diameter. The resistivity of nickel is 7.8×10-8Ω⋅m.

A-)Calculate the resistance of this cable?

B-)If we think of this cable as a single material, what is its equivalent resistivity?

Science   Advanced-Physics   
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