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