wire of length and resistance is strecth so that it length is double and area of cross section is half.How will it resitivity change
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Resistivity= resistance*area of cross
section
new Resistivity=(r*a/2)/2l
=r*a/4l
new Resistivity=1/4*resistivity
So, the new Resistivity will be 1/4 of original resistivity.
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Resistivity= resistance*area of cross
section
new Resistivity=(r*a/2)/2l
=r*a/4l
new Resistivity=1/4*resistivity
So, the new Resistivity will be 1/4 of original resistivity.
perfectly fine pure correct answer
hope it helps you mark me as brainliest and follow me
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