Current Electricity and Electrical InstrumentHard
Question
A voltmeter connected in series with a resistance R1 to a circuit indicates a voltage V1 = 198 V. When a series resistor R2 = 2R1 is used, the voltmeter indicates a voltage V2 = 180 V. If the resistance of the voltmeter is RV = 900Ω then, the applied voltage across A and B is:-
Options
A.210 V
B.200 V
C.220 V
D.240 V
Solution
198 = 
........(i)
180 =
× 900 ........(ii)
divided Eq (i) by (ii)
and on solving it R1 = 100 Ω
Now put value of R1 in any one equation.
........(i)180 =
× 900 ........(ii)divided Eq (i) by (ii)
and on solving it R1 = 100 Ω
Now put value of R1 in any one equation.
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