For the circuit shown in the figure, the current \(I\) will be:

1. \(0.75~\text{A}\) 2. \(1~\text{A}\)
3. \(1.5~\text{A}\) 4. \(0.5~\text{A}\)
Subtopic:  Grouping of Cells |
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A battery consists of a variable number \(n\) of identical cells (having internal resistance \(r\) each) which are connected in series. The terminals of the battery are short-circuited and the current \(I\) is measured. Which of the graphs shows the correct relationship between \(I\) and \(n?\)

1.   2.
3. 4.
Subtopic:  Grouping of Cells |
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Two cells having the same emf, are connected in series through an external resistance R. Cells have internal resistance r1 and r2 respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:

1. r1-r2

2. r1+r22

3. r1-r22

4. r1+r2

Subtopic:  Grouping of Cells |
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Two batteries, one of emf \(18\) volts and internal resistance \(2~\Omega\) and the other of emf \(12\) V and internal resistance \(1~\Omega,\) are connected as shown. The voltmeter \(\mathrm{V}\) will record a reading of: 

        

1. \(18\) V
2. \(30\) V
3. \(14\) V
4. \(15\) V

Subtopic:  Grouping of Cells |
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