Question

u Find the resistance of 0.1 km long copper wire. The area of cross section wire is som take resistivity of copper of 1.7810-8 ohm - meter.​

Answer 1

Answer:

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Explanation:

We know that resistance R=

A

ρ×l

, here, l=1km=1000m,A=0.02cm

2

,ρ=1.62×10

−8

Ω−m

=

2×10

−2

×10

−4

1.62×10

−8

×1000

=8.1Ω

so resistance will be 8.1Ω