calculate the resistance of a copper wire 20 long and diameter of 0.05 CM specific resistance of copper is equal to 1.678 into 10-6 raise to minus 6 ohms ohms centimetre
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R = ρL / A
= ρL / (πr²) …………[∵ Cross section of wire is circular]
= (1.678 × 10^-6 Ω m × 20 m) / [π × (0.05/2 × 10^-2 m)^2]
= 170.91 Ω
Resistance of wire is 170.91 Ω
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