In the adjacent figure , find the distance in kilometer
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Resistance of wire depends upon resistivity, length and area of cross section,in simple words resistance is directly proportional to lenght and inversely proportional to cross sectional area. In this case since lenght is halfed and area is doubled resistance decreases by 4 times.
R~l/a(R is proportional to l/a). So numerator becomes 1/2 and denominator gets multiplied by 2 final answer will be 1/4 times the previous value.
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