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Sir,.
I have a doubt with the key in physics Paper 2, in jee 2010. Filaments with powers 100w. 60w and 40w are provided.Then the relation between their resistances is 1/R100 > 1/R60 > 1/R40.AGREED.But Y cant it be 1/R100 = 1/R60 + 1/R40?