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Q. 4. A wire of 12 Ί resistance is stretcheddouble its length. Find out the new resistance of thwire.

Answer»

As we know that ;Resistance = Resistivity*length/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 = resistivity*2length/area/2New resistance =(resistivity*length/area)*4New resistance = 4resistance

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