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NEET 2015 (AIPMT, Cancelled Paper) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from NEET 2015 (AIPMT, Cancelled Paper)

Q181NEET 2015 · AIPMT · CANCELLED PAPERMedium

Kirchhoff's Laws & Measuring Instruments

A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively, Then

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Answer: (c)

B and C are in parallel: $\dfrac{1.5R \times 3R}{4.5R} = R$ .
This $R$ is in series with A (also $R$ ), so the voltage divides equally: $V_A = V_{BC}$ .
B and C are in parallel, so $V_B = V_C = V_{BC} = V_A$ .
So the answer is (c) $V_A = V_B = V_C$ .

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