What is the resistance of a copper wire 200 ft long and
0.01 in. in diameter (T 20°C)?

R = 20.21 ohms

Explanation:

Given that,

The length of the wire, l = 200 ft

The diameter of the wire, d = 0.01 in

Radius, r = 0.005 in

200 ft = 60.96 m

0.005 in = 0.000127 m

The resistivity of copper is,

So, the resistance of a wire is given by :

So, the resistance of the copper wire is 20.21 ohms.

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