Solution: The resistivity of gold is 2.44 x 10 -8 Ω•m at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to:
A) 0.077 mW
B) 0.25 mW
C) 0.14 mW
D) 0.19 mW
E) 0.31 mW

The resistivity of gold is 2.44 x 10 ^{-8} Ω•m at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to:

A) 0.077 mW

B) 0.25 mW

C) 0.14 mW

D) 0.19 mW

E) 0.31 mW