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Question

A wire of given material having length l and area of cross-sectional area A has a resistance of 4 ohms. What would be the resistance of another wire of the same material having length l2 and area of cross-section 2A?

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Solution

We know that, R=ρlA=4 Ω.
Now, R=ρlA=ρl22A
R=ρl4A=R4=1 Ω.


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