A Carbon Resistor Is Made of a Cylinder of Carbon

question 30

Multiple Choice

A carbon resistor is made of a cylinder of carbon, of diameter 7.4 mm. If the resistivity of carbon is 3.5 × 10⁻⁵ W·m, and a potential difference of 0.15 V causes a current of 12 A to flow through the resistor, what is the length of the cylinder?

• A) 6.1 cm
• B) 1.5 cm
• C) 0.15 cm
• D) 0.5 cm

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Definitions:

Identical Twins

Twins that develop from a single fertilized egg that splits and forms two embryos, sharing 100% of their DNA.

Fraternal Twins

Siblings born at the same time but are the result of two different eggs fertilized by two different sperm, sharing about 50% of their DNA, similar to ordinary siblings.

Eysenck

A psychologist known for his work in the fields of personality, behavior genetics, and the biological basis of intelligence.

Extraversion-Introversion

A personality dimension that characterizes individuals on a continuum from outgoing and energy-gathering from external sources (extraversion) to quiet and energy-gathering from internal sources (introversion).