In the circuits shown below, the readings of the voltmeters and the ammeters will be,

In the circuits shown below, the readings of the voltmeters and the ammeters will be,
  1. V2>V1 and i1=i2
  2. V1=V2 and i1>i2
  3. V1=V2 and i1=i2
  4. V2>V1 and i1>i2

Solution

For an ideal voltmeter, resistance is infinite RV=, so it will not draw any amount of current from the circuit and for ideal ammeter resistance is zero.

Then for the first figure R1=10 Ω, RV= and both are in a parallel arrangement, so

1Req=1R1+1RV1Req=110+1Req = 10 Ω

and current in the first circuit is, i1=V1Req=1010= 1 A

So, for the first circuit, ammeter and voltmeter readings are V1=10 V, i1=1 A, respectively.

For the second figure voltmeter and resistant of 10 Ω are in series and also connected parallel to another resistant of 10 Ω. So, equivalent resistant is 

1R'eq=1R1+1R2+RV1R'eq=110+110+=110+0=110R'eq=10 Ω

 Current in the circuit is, i2=V2Req'=1010=1 A

 Ammeter and voltmeter readings for the second circuit is V2=10 V, i2=1 A

 For both the circuit is 
V1=V2=10 V, i1=i2=1 A 

Asked in: NEET 2019 (All India)

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