Question

Example 5: Determine the resistance of a copper wire having a length of 1 km and
diameter of 0.5 mm​

Answer 1

Answer:

85 Ω

Explanation:

Diameter = 0.5mm = 0.0005 m

Length = 1km = 1000 m

Radius = diameter /2 = 0.0005/2 = 0.00025 m

We know,

Resistance = ρ × (L÷A)

where (ρ) = density of copper = 0.0017 Ωm

L = length

A = area = π × r^2 = 3.14 × (0.00025)^2

Now.

Resistance = 0.0017 × (1000 ÷ (3.14 × (0.00025)^2))

= 85 Ω

Required, Resistance is 85 Ω

Answer 2

Answer:

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