Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m^2 and 5m^2 respectively.(a) 5:7(b) 2:7(c) 2:5(d) 7:5This question was addressed to me during an online interview.Enquiry is from Resistivity in chapter Simple DC Networks of Basic Electrical Engineering

Calculate the ratio of the resistivity of 2 wires having the same leng

1.	Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m^2 and 5m^2 respectively.(a) 5:7(b) 2:7(c) 2:5(d) 7:5This question was addressed to me during an online interview.Enquiry is from Resistivity in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Right answer is (c) 2:5 Explanation: Resistivity = R*A/L Since resistance and LENGTH of the two wires are same so resistivity is DIRECTLY proportional to area of CROSS SECTION. Ratio of area is 2:5 so the ratio of resistivity is also 2:5.

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