We haveResistance= RESISTIVITY x LENGTH/areaWhen the wire is stretched to double the length , the area of CROSS SECTION GETS reduced to half.SoNew Resistance = Resistivity x 2length/area/2I.e,New resistance = (Resistivity x area/length)x4i.e, New resistance = Resistance x 4So when the wire is stretched, the resistance multiplies by four times.
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