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A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be 

(1) 0.5 V/m

(2) 2 V/m

(3) 5 V/m

(4) 10 V/m

PMT