[問題]關於電阻的問題
Cheap resistor are fabricated by depositing a thin layer of carbon onto
a nonconducting cylindrical substrate. If such a cylinder has radius a
and length d, determine the thickness of the film required for a
resistance R if
a = 1 mm
R = 33 kilo-ohm
σ(conductivity) = 2.9 MS/m
d = 9 mm
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