Question

.Calculate the resistance of 0.5 km long
copper wire of diameter 1 mm.
(Resistivity of copper is 1.72 × 10−8
A. 1.6 Ω
B. 2.7 Ω
C. 10.9 Ω
D. 7.4 Ω

Answer 1

Answer:

C.

Explanation:

R=pl/A

A=pi r^2

=22/7*[(10^-3)/2]^2

R=1.72*10^-8 * 500/A

=10.9ohm

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Answer 2

Answer:

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C. 10.9 Ω