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Question

The figure shows a portion of a circuit.  Resistor are known and indicated on diagram and voltmeter are identical.  If voltmeters v1  and v2 reads 7.5v and 5v respectively then reading v3


  1. 0 v

  2. 2.5 v

  3. 10 v

  4. 3.0 v


Solution

The correct option is B

2.5 v


I1I2=32 let I2=xI1=32x
9×32×14x+57.5=0
X=5.0A=I27.5A=I127x28x2=2.5
Hence resistance of voltmeter is 1\Omega 
25I3=7.57.5×9=75I3=3A
Hence V3=3.0V
 

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