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2A Wire of. given material having length T' and area of cross-section A' has aresistance of 82. What would be the resistance of another wire of the same materialhaving lengthand area of cross- section 2.A.2

Answer»

We know that the resistance is P(rho) l/a. We can ignore P over here because the material is same in both cases. Now, R=l/a. 8=l/a. In the second case, they are asking resistance if the area is double and length is halved. So, R=l/2 whole divided by 2a.We get R=l/4a. But we l/a=4. So, 4/4=1 and so the answer is 1 ohm.



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