A piece of copper of mass 50 g is drawn into a wire of length 50 m. Find the resistence of the wire . The density and specific resistence of copper are 8.9 * 10^3 kg m^-3 and 1.7 * 10^-8 ohm-m

Since mass/(length×density) will give you the area.now put it in the formula R=specific resistance ×length /area
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