The lenth of a wire is made to increase by 75 % by streaching what will be the % change in the regesitance in the wire
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- Let L be the length of the wire L is increased by 75% New length= L + (percentage increase in L) l = L +3/4L I = 7L/4 Initial resistance, R = ∫L/A New resistance = ∫7L/4A R’= 7/4 (∫L/A) Which is: R’ = 7/4R So % change in resistance is (7/4 - 1 ) 100 = 75%
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