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When the length and area of cross-section both are doubled, then its resistanceA. unchangedB. halvedC. doubledD. quadrupled |
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Answer» Correct Answer - a Initial length of the conductor `I_(1)=I` Find leght of the conductor Initial cross-sectional area `A_(1)=A` Final cross-sectional area `A_(2)=2A` The resistance of conductors given by `R=rho(I)/(A) prop (I)/(A)` As both the length and area doubled Hence, there will be no change in the resistance of the conductor and so it will remain unchanged. |
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