Asked by schwartz mutohwe

The resistivity of copper is 1.3×10^-9 ohms. What is the length of a wire whose resistance is 0.25 ohms, diameter 10^-8 m.
Answered by Damon
Give ALL the units of resistivity. Then the problem solves itself as long as you know Area of circle = pi d^2/4

Resistance = resistivity * length/area
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