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JEE Main 2014 (11 Apr, Shift 1) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2014 (11 Apr, Shift 1)

Q184JEE Main 2014 · 11 APR · SHIFT 1Medium

Kirchhoff's Laws & Measuring Instruments

In the circuit diagrams (A, B, C and D) shown below, R is a high resistance and S is a resistance of the order of galvanometer resistance G. The correct circuit, corresponding to the half deflection method for finding the resistance and figure of merit of galvanometer, is the circuit labelled as:

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Answer: (d)

Half deflection method: high resistance R in series with G and the cell (key $K_1$ ).
S (of the order of G) is connected in parallel with G through key $K_2$ , so closing $K_2$ shunts G.
Only circuit (d) has R in series and S with $K_2$ across G.
So the answer is (d).

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