Current Electricity 4 Question 25
25. Consider two identical galvanometers and two identical resistors with resistance $R$. If the internal resistance of the galvanometers $R _c<R / 2$, which of the following statement(s) about anyone of the galvanometers is (are) true?
(2016 Adv.)
(a) The maximum voltage range is obtained when all the components are connected in series
(b) The maximum voltage range is obtained when the two resistors and one galvanometer are connected in series, and the second galvanometer is connected in parallel to the first galvanometer
(c) The maximum current range is obtained when all the components are connected in parallel
(d) The maximum current range is obtained when the two galvanometers are connected in series, and the combination is connected in parallel with both the resistors
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Solution:
- For maximum range of voltage resistance should be maximum. So, all four should be connected in series. For maximum range of current, net resistance should be least. Therefore, all four should be connected in parallel.
