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Two identical galvanometers (each of internal resistance R_G) and two identical resistors (each of resistance R) are available, with R_G < R/2. For any one galvanometer, which statement(s) is/are true?

1. The maximum voltage range is obtained when all four components are connected in series
2. The maximum voltage range is obtained when the two resistors and one galvanometer are in series and the second galvanometer is connected in parallel across the first
3. The maximum current range is obtained when all four components are connected in parallel
4. The maximum current range is obtained when the two galvanometers are in series and that combination is connected in parallel with both resistors

Correct answer: The maximum voltage range is obtained when the two resistors and one galvanometer are in series and the second galvanometer is connected in parallel across the first

Solution

Given R_G < R/2, the voltage range is greatest in configuration (B) and the current range is greatest in configuration (C); these are the official correct options (JEE Advanced 2016).

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