A copper wire has a resistance of \( 0.60 hm \). Anozner copper wire of the samemass as the first one is dou ble in length of the first. Find the resistance of the second wire.

Monjur Alahi

A copper wire has a resistance of \( 0.6 0hm \). Another copper wire of the same mass as the first one is double in length of the first. Find the resistance of the second wire.


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Salim Ahmed Kawsar

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We know that R = ρl/A

R ∝ l

R1/R2 = l1/l2

Given

∵ l2 = 2l1

R1 = 0.60 hm

R2/R1 = l2/l1

R2/R1 = 2l1/l1

R2 = 2 R1

R2 = 2 x 0.60

R2 = 1.2 hm

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