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Q.

A voltmeter with resistance 2500  Ω indicates a voltage of 1 25 V in the circuit shown in figure. What is the series resistance to be connected to voltmeter so that it indicates 100 V? Consider ideal battery.

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a

625  Ω

b

120  Ω

c

550  Ω

d

Data insufficient

answer is A.

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Detailed Solution

Emf should be 125 V.For second case:  1002500 =25R ⇒ R = 625 Ω
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