The Resistivity of Gold Is $2.44 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$

Multiple Choice

The resistivity of gold is $2.44 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$ at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 mA. What power is dissipated in this wire at 20°C?

A) 0.31 mW
B) 0.077 mW
C) 0.14 mW
D) 0.19 mW
E) 0.25 mW