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neduet
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Homework Statement
A conductor has cross-section of 10 cm2 and specific resistance of 7.5 ohm cm at 0 degree C
what will be its resistance in ohm per/kilometer when the temperature is 40 degree C ?
take temperature co-efficient of the material is 0.005 / degree C
i can't find the solution of it. please give me solution if you can
please help me
Homework Equations
Resistance of a wire in Ω
R = ρL/A
ρ is resistivity of the material in Ω-cm
L is length in cm
A is cross-sectional area in cm²
The Attempt at a Solution
R = (7.5 Ω-cm)(L) / 10 cm²R/L = 0.75 Ω/cmR/L = 0.75 Ω/cm x 100000 cm/km = 75000 Ω/km
R/L = 75000 Ω/km x [1+ (0.005/C)*40C]
R/L = 90000 Ω/km