The resistance of a wire is \(R\) ohm. If it is melted and stretched to \(n\) times its original length, its new resistance will be:
1. \(nR\)
2. \(\frac{R}{n}\)
3. \(n^2R\)
4. \(\frac{R}{n^2}\)

Subtopic:  Derivation of Ohm's Law |
 82%
From NCERT
NEET - 2017
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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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The effective resistance between points \(P\) and \(Q\) of the electrical circuit shown in the figure is:
              
1. \(\frac{2 R r}{\left(R + r \right)}\)
2. \(\frac{8R\left(R + r\right)}{\left( 3 R + r\right)}\)
3. \(2r+4R\)
4. \(\frac{5R}{2}+2r\)

Subtopic:  Combination of Resistors |
 76%
From NCERT
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The potential difference across \(8\) ohms resistance is \(48\) volts as shown in the figure below. The value of potential difference across \(X\) and \(Y\) points will be:

   
1. \(160\) volt
2. \(128\) volt
3. \(80\) volt
4. \(62\) volt

Subtopic:  Kirchoff's Voltage Law |
 62%
From NCERT
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A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is:

1. 1.5 V

2. 3.0 V

3. 0.67 V

4. 1.33 V

Subtopic:  Meter Bridge & Potentiometer |
 68%
From NCERT
PMT - 1997
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The current in the arm \(CD\) of the circuit will be:
             
1. i1+i2

2. i2+i3

3. i1+i3

4. i1i2+i3

Subtopic:  Kirchoff's Current Law |
 85%
From NCERT
PMT - 1998
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A battery of emf \(E\) and internal resistance \(r\) is connected to a variable resistor \(R\) as shown below. Which one of the following is true​​​​​​?

           

1. Potential difference across the terminals of the battery is maximum when \(R=r\).
2. Power delivered to the resistor is maximum when \(R=r\).
3. Current in the circuit is maximum when \(R=r\).
4. Current in the circuit is maximum when \(R>>r\).
Subtopic:  EMF & Terminal Voltage |
 64%
From NCERT
PMT - 1995
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The total current supplied to the circuit by the battery is:

         

1. \(1~\text{A}\)
2. \(2~\text{A}\)
3. \(4~\text{A}\)
4. \(6~\text{A}\)

Subtopic:  Combination of Resistors |
 65%
From NCERT
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Equivalent resistance across terminals \(A\) and \(B\) will be:

          
1. \(1~\Omega\)
2. \(2~\Omega\)
3. \(3~\Omega\)
4. \(4~\Omega\)

Subtopic:  Combination of Resistors |
 71%
From NCERT
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What is the equivalent resistance of the circuit​​​​​?

           

1. \(6~\Omega\)
2. \(7~\Omega\)
3. \(8~\Omega\)
4. \(9~\Omega\)

Subtopic:  Combination of Resistors |
 70%
From NCERT
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