If the resistance of wire A is four times the resistance of wire B, find the ratio of their cross sectional area and the ratio of the radii of their wires
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The ratio of the cross sectional area and radius are 1:2 and 1:√2. So, The resistance of the wire is inversely proportional to the square of area of cross section. Hence, The ratio of the cross sectional area and radius are 1:2 and 1:√2.
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