A wire of resistance 2 ohm is stretched uniformly until its area of cross section becomes half as its initial area. Find the new resistance of wire
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The resistance of a wire is r if the length of the wire is doubled by stretching then the new resistance will be
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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