Question

if an iron wire is drawn to decrease its radius by 0.5%.Then percentage of increase in its resistance will be​

Answer 1

HERE IS UR ANSWER

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Delta R/R×100=-4Delta r/r×100

DeltaR/R%=-4×0.5=2%

ɧԾρe ɿԵ ɧeʅρՏ ՎԾՄ 

Answer 2

Answer:-

∆ R/R×100

=-4∆ r/r×100

∆R/R%

=-4×0.5

=2%