A copper wire of length 30.001 m connects two poles 30 m apart at 30°C. In winter the temperature drops to 4°C. ($\alpha

Question

A copper wire of length 30.001 m connects two poles 30 m apart at 30°C. In winter the temperature drops to 4°C. ($\alpha_{Cu} = 16.7 	imes 10^{-6}$ K$^{-1}$.) The new length of the wire is approximately —

Accepted Answer

29.988 m

Answer

30.001 m

Answer

30.014 m

Answer

29.500 m

A copper wire of length 30.001 m connects two poles 30 m apart at 30°C. In winter the temperature drops to 4°C. (αCu=16.7×10−6\alpha_{Cu} = 16.7 \times 10^{-6}αCu​=16.7×10−6 K−1^{-1}−1.) The new length of the wire is approximately —

A copper wire of length 30.001 m connects two poles 30 m apart at 30°C. In winter the temperature drops to 4°C. ( $\alpha_{Cu} = 16.7 \times 10^{-6}$ K $^{-1}$ .) The new length of the wire is approximately —