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The purpose of high resistance R2 is to reduce the current through the galvanometer. When jockey is far from balance point, this saves the galvanometer and the cell (of emf ε) from being damaged.
(ii) When resistance R1 is decreased, the potential gradient of potentiometer wire increases, so balance point (J) shifts to longer length of wire.
(iii) (1) The balance point is not obtained because maximum emf across potentiometer wire is 2V.
(2) When key (K) is closed, the terminal potential difference of cell is zero; so balance point cannot be between Aand B. (Since V = kl => l = 0 for V = 0)
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