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Q.

A constant 60 V. dc supply is connected across two resistors  of resistance 400  kΩ   and  200   kΩ.What is the reading of the voltmeter, also of resistance  200   kΩ, when connected across the second resistor as shown in figure?

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a

12 V

b

15 V

c

30 V

d

20  V

answer is A.

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Detailed Solution

Effective resistance across the voltmeter is 200/2   kΩ.

Total resistance across dc supply is 400+100=500  Ω

Thus, the voltage across the voltmeter is 100/500(60  V)=12  V

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