A wire of length l is stretched to double its lenght what is new resistnc and resistivity
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let the length of the wire be "l" and its initial resistance and resistivity be "R" and "rho" respectively
we know that
R is directly proportional to l
and rho is inversely proportional to l,
therefore,
when "l" is doubled the resistance is also doubled and the resistivity is halved.
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