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 |
 81%
From NCERT
NEET - 2020
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Two batteries, one of emf \(18~\text{V}\) and internal resistance \(2~\Omega\) and the other of emf \(12\) V and internal resistance \(1~\Omega\), are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)

           

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

Subtopic:  Grouping of Cells |
 78%
From NCERT
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Current through the \(2~\Omega\) resistance in the electrical network shown is:

      

1. zero 2. \(1\) A
3. \(3\) A 4. \(5\) A
Subtopic:  Grouping of Cells |
 77%
From NCERT
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A current of \(2\) A is to be sent through a resistor of \(5 ~\Omega.\) Number of cells required in series, if each has emf \(2\) V and internal resistance \(0.5~\Omega,\) are:
1. \(40\)
2. \(30\)
3. \(20\)
4. \(10\)

Subtopic:  Grouping of Cells |
 76%
From NCERT
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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 |
 72%
From NCERT
AIPMT - 2005
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A battery consists of a variable number \('n'\) of identical cells having internal resistances connected in series. The terminals of battery are short circuited and the current \(i\) is measured. The graph below that shows the relationship between \(i\) and \(n\) is:

1.   2.
3. 4.
Subtopic:  Grouping of Cells |
 71%
From NCERT
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Eels are able to generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in \(100\) rows, each row stretching horizontally along the body of the fish containing \(5000\) electroplaques. The arrangement is suggestively shown below. Each electroplaques has an emf of \(0.15\) V and internal resistance of \(0.25~\Omega\).

The water surrounding the eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of \(500~\Omega\), the current an eel can produce in water is about:

1. \(1.5\) A 2. \(3.0\) A
3. \(15\) A 4. \(30\) A
Subtopic:  Grouping of Cells |
 66%
From NCERT
AIIMS - 2004
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Two cells of emf \(E\) and internal resistance \(r_1\) and \(r_2\) are connected in series through an external resistance \(R\). The value of \(R\) for which the potential difference across one of the cells becomes zero will be:

1. \(\dfrac{r_{1} r_{2}}{r_{1}   +   r_{2}}\) 2. \(r_{1} + r_{2}\)
3. \(|r_{1} - r_{2}|\) 4. \(\dfrac{r_{1}}{r_{2}}\)
Subtopic:  Grouping of Cells |
 57%
From NCERT
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In the circuit shown below, \(E_1 = 4.0~\text{V}\), \(R_1 = 2~\Omega\)\(E_2 = 6.0~\text{V}\), \(R_2 = 4~\Omega\) and \(R_3 = 2~\Omega\). The current \(I_1\) is:

    

1. \(1.6\) A

2. \(1.8\) A

3. \(1.25\) A

4. \(1.0\) A

Subtopic:  Grouping of Cells |
 53%
From NCERT
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\(12\) cells each having the same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two similar cells which are in series. Current is \(3~\text{A}\) when cells and battery aid each other and is \(2~\text{A}\) when cells and battery oppose each other. The number of cells wrongly connected is/are:
1. \(4\)
2. \(1\)
3. \(3\)
4. \(2\)

Subtopic:  Grouping of Cells |
 51%
From NCERT
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