a wire of length l and resistance r is stretched so that its length is doubled and area of cross section is halved. How will it’s (i) resistance change? (ii ) resistivity change?
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R=pl/A
R1=p2×2l/A
R1=4R1
The resistivity first change it remains constant as it depends only upon temperature and not shape and size
I hope this helps ( ╹▽╹ )
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Answer:
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 then
a. its resistance will increase 4 times.
b. its resistivity will not change as it does not depend on length and area, its a property of the material
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