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Giving reason,explain how the resistivity of the conductor veryfi .

a) area is halfed ii) lenght is doubled
b)area is doubled iv)both area & lenght are doubled


Wkt   R is directly proportional to l
                R    α   l
and inversely proportional to area of cross section
                R    α   1/A
a)area is halved
    R is doubled
b)length is doubled
    R is halved
c)area is doubled
    R is halved
d)area and length is doubled
    R remain same

1 5 1
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