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You want to make a resistor of 1.0Ω out of carbon rod of diameter 1.0mm. How long a piece of carbon do u need?
You want to make a resistor of 1.0Ω out of carbon rod of diameter 1.0mm. How long a piece of carbon do u need?
By R = rho x L/A
=>1 = 3.5 x 10^-5 x L/(pi x r^2)
=>L = [3.14 x (0.5 x 10^-3)^2]/(3.5 x 10^-5)
=>L = 0.022m
=>L = 2.2 cm
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