Explanation:
It is given that,
Length of the copper wire, l = 4.4 m
Diameter of copper wire, d = 1.3 mm = 0.0013 m
Radius of copper wire, r = 0.00065 m
The resistivity of the copper wire, ![\rho=1.68\times 10^{-8}\ \Omega-m](https://tex.z-dn.net/?f=%5Crho%3D1.68%5Ctimes%2010%5E%7B-8%7D%5C%20%5COmega-m)
We need to find the resistance of the copper wire. It is given by :
![R=\rho\dfrac{l}{A}](https://tex.z-dn.net/?f=R%3D%5Crho%5Cdfrac%7Bl%7D%7BA%7D)
![R=1.68\times 10^{-8}\ \times \dfrac{4.4\ m}{\pi (0.00065)^2}](https://tex.z-dn.net/?f=R%3D1.68%5Ctimes%2010%5E%7B-8%7D%5C%20%5Ctimes%20%5Cdfrac%7B4.4%5C%20m%7D%7B%5Cpi%20%280.00065%29%5E2%7D)
R =0.055 ohms
So, the resistance of the copper wire is 0.055 ohms. Hence, this is the required solution.
The molecules will heat up and move faster, some evaporating and turning to gas, the toy boat will heat up if made of conducting materials but otherwise unchanged. The water will also start to boil.