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A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.0 mm^2. When a
potential difference of 9V is applied across the ends of the rod, the rod carries a current of 4 mA. Find (a) the
resistance of the rod; (b) the length of the rod if the resistivity of carbon is 3.5 x 10^-5 ohm-m.​

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Answer:

A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.0 mm^2. When a

potential difference of 9V is applied across the ends of the rod, the rod carries a current of 4 mA. Find (a) the

resistance of the rod; (b) the length of the rod if the resistivity of carbon is 3.5 x 10^-5 ohm-m.

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