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

question 204

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

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