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hm okay so basically there are 2 factors that affect the R, which drops the V.
the factors are : length of wire current has travelled through and the resistivity of the wire
since the rate of current passing through the wire is always the same under same resistivty so we know gradient will be a constant.
Since the change in resistivity is descrete not continuous so there will be sudden gradient change between P1 P2 and P2 P3
tyvm, i understand it now.