2. A wire of length L, m is redrawn to a length2L m, then the resistan – InterviewSolution

1.	2. A wire of length L, m is redrawn to a length2L m, then the resistance will(a) increase two times(b) not charge(c) decrease to 1/4 of the original(d) increase four times.
Answer» As we know that ;Resistance = Resistivitylength/areaHere we note that the resistance is directly proportional to length and inversely proportional to area of cross section ....Now a/c to question,;Length of wire is double then area is reduced to half...NowNew resistance = resistivity2length/area/2New resistance =(resistivitylength/area)4New resistance = 4resistanceOption (4) is correct.

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