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10 Question-answer on potentiometer 1.        The length of a potentiometer wire is 5 meters. An electron in this wire experiences a force of 4.8 × 10 -19 newton, e.m.f. of the main cell used in potentiometer is: (a)     3 volt (b)    15 volt (c)     1.5 volt (d)    5 volt Ans: (b) 2.        A 10 m long wire of resistance 20Ω is connected in series with a battery of e.m.f. 6 V and resistance of 10Ω. The potential gradient along the wire in volt per metre is: (a)     0.4 (b)    1 V (c)     0.2 (d)    1.2 Ans: ( a) 3.        In a potentiometer experiment the balancing length with a cell in open circuit is 250 cm. on shunting the cell with a resistance of 2 Ω, the balancing length becomes 200 cm. the internal resistance of the cell is: (a)     0.1Ω (b)  ...