A 10 V battery with internal resistance1\Omega and a 15V battery with internal resistance 0.6\Omega are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to :

  • Option 1)

    11.9 V

  • Option 2)

    12.5 V

  • Option 3)

    13.1 V

  • Option 4)

    24.5 V

 

Answers (2)

As we discussed in

In closed loop -

-i_{1}}R_{1} + i_{2}}R_{2} -E_{1}-i_{3}}R_{3}+E_{2}+E_{3}-i_{4}}R_{4}=0

- wherein

 

 Current in the circuit 

I=\frac{5}{1.6}=\frac{50}{16}=\frac{25}{8}A

Reading of the voltmeter 

V=15-\frac{25}{8}\times 0.6

V=15-\frac{15}{8}=13.1V


Option 1)

11.9 V

The option is incorrect 

Option 2)

12.5 V

The option is incorrect 

Option 3)

13.1 V

The option is correct 

Option 4)

24.5 V

The option is incorrect 

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