What is the diameter of a 1.00-m length of tungsten wire whose resistance is 0.50 Ω ?
here,
length of wire , l = 1 m
resistivity of tungsten , p = 5.6 * 10^-8 ohm.m
let the diameter of wire be d
resistance , R = p * l/area
0.5 = 5.6 * 10^-8 * 1 /(pi * (d/2)^2)
solving for d
d = 3.78 * 10^-4 m
the diameter of wire is 3.78 * 10^-4 m
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