Three resistors are connected in series with ideal cell of emf 62 V.Measurements are carried out by a single voltmeter.The results of measurements are VAB=VBC=VCD=20V. Then
A
VAC=40V
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B
VAB will be less than 40 v
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C
Resistance of voltemeter is 20R1
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D
R1=R2=R3
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Solution
The correct options are AVAC=40V C Resistance of voltemeter is 20R1 DR1=R2=R3 From symmetry R1=R2=R3=R let resistance of voltmeter be RV then
20=iRV=(I−i)R -----(1) and 20=62−2IR -----(2) By (1) & (2) RV=20R
than ⇒ Req=R+2R×20R22R Req=3111R I′=6231×11=22R VAC=I′×2011R=2011×=40V