How is the resistance of a wire affected if a) Its length is doubled b) Its area is doubled c) Its radius is doubled

How is the resistance of a wire affected if a) Its length is doubled b

1.	How is the resistance of a wire affected if a) Its length is doubled b) Its area is doubled c) Its radius is doubled
Answer» tion:resistance= rho X length/area of cross-sectionso, resistance is directly proportional to length and if the length is DOUBLED the resistance gets doubled as wellb) resistance is inversely proportional to the area of cross-section so if area is doubled, the resistance is HALVEDC) R1=¶ l/2πr1 R2=¶ X l/2π2r1or, R2=¶X l/4πr1or, R2=(1/2)X R1

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How is the resistance of a wire affected if a) Its length is doubled b) Its area is doubled c) Its radius is doubled

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