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Q.

In figure, when an ideal voltmeter is connected across  4000   Ω resistance, it reads 30 V. If the voltmeter is connected across  3000   Ω resistance, it will read 

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a

22.5 V

b

35 V

c

20 V

d

40 V

answer is B.

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Detailed Solution

Let I be the current in the circuit, then  I×4000=30  V

If voltmeter is put across  3000  Ω resistance, then reading of voltmeter is 

I×3000=304000×3000=22.5  V

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