A Carbon Resistor Is Made of a Cylinder of Carbon,of $\times$

question 8

Multiple Choice

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

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