A wire is stretched twice its length , th new resistances will be a)4 times of the original resistances b) Double the original resistances c) Half of the original resistances d) One fourth of the original resistances
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A wire is stretched twice its length , th new resistances will be a)4 times of the original resistances b) Double the original resistances c) Half of the original resistances d) One fourth of the original resistances
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(d) Resistivity of wire remains constant. As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.
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