A carbon resistor is made of a cylinder of carbon,of length 1.5 cm.If the resistivity of carbon is 3.5 $\times$ 10^-5 $\Omega$ m and when placed in a circuit a potential difference of 0.15 V exists when 12 A flows across the resistor,what is the radius of the cylinder? A) 6.5 mm B) 12 mm C) 3.7 mm D) 1.2 mm

Question

Quizplus · Accepted Answer

Using the formula R = ρL/A, where R = V/I, we can solve for the area A and then find the radius. The radius is approximately 3.7 mm.

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