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My car has rear defrosters that are made of 13 wires embedded into the rear window. They can melt a thin layer of ice, roughly 2.25*10^-2 kg worth, in two minutes. These wires are all in parallel and are connected to the 12V battery of my car. Each is about 1.25 m long probably has a resistivity around 90*10^-8 (Omega*m). What is the cross-sectional area of each wire?

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