If the length of a wire is doubled and area of croos section is halved find change in resistance and resistivity
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resistance will become four times of the initial because
R= rho×l/A
from here R is proportional to the length and inversly proportional to the area
hence R'=4R
and resistivity remains unchanged because it is material dependent quantity
R= rho×l/A
from here R is proportional to the length and inversly proportional to the area
hence R'=4R
and resistivity remains unchanged because it is material dependent quantity
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