Answer to Question #282921 in Atomic and Nuclear Physics for BIGIRMANA Elie

Question

 A copper wire is stretched to make it 0.2% longer. What is the percentage change in its resistance?

Answer 1

$R\sim \frac lS,$

$l_1=1.02l,$

$S_1=0.98 S,$

$R_1\sim\frac{1.02l}{0.98S}=1.04\frac lS,$

$R_1=1.04R,$ 4%.