Answer to Question #238206 in Electricity and Magnetism for Pheladi

Question #238206
Resistance of a wire is y ohm.the wire is stretched to triple it's length,then the resistance becomes
1
Expert's answer
2021-09-16T14:19:02-0400

initial length = L

final length = 3L

initial resistance = y

R2=n2R1R2=32yR2=9y  ohmR_2 =n^2R_1 \\ R_2 = 3^2y \\ R_2 = 9y \; ohm


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