The correct graph showing the variation of the resistance (R) of a cylindrical metal wire as a function of its radius (r), keeping its length and temperature constant, is :

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MCQ (Single)Electrical ResistanceCBSE PYQ

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The masses of two cylindrical wires of copper are in the ratio of 1 : 3 and their lengths are in the ratio of 5 : 3. The ratio of their resistances will be :

MCQ (Single)Electrical ResistanceElectrical Resistivity and Conductivity