a wire of length L and resistance R the s stretdhed so that its doubled. how will the resistance and the resistivity change
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If a wire of length L and resistance R is stretched so that its length is doubled and the area of cross-section is halved. It means, L' = 2L and A' = A/2. ... So, the new resistance becomes 4 times of the initial resistance. (2) The resistivity of a wire remains the same on changing its length and area of cross section.
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