Internal resistance of a \(2.1~\text{V}\) cell which gives a current of \(0.2~\text{A}\) through a resistance of \(10~\Omega\) is:
1. \(0.5~\Omega\)
2. \(0.8~\Omega\)
3. \(1.0~\Omega\)
4. \(0.2~\Omega\)
Subtopic:  EMF & Terminal Voltage |
 83%
From NCERT
AIPMT - 2013
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A battery of internal resistance \(r\), when connected across \(2~\Omega\) resistor supplies a current of \(4~\text{A}\). When the battery is connected across a \(5~\Omega\) resistor, it supplies a current of \(2~\text{A}\). The value of \(r\) is: 
1. \(2~\Omega\) 2 \(1~\Omega\)
3. \(0.5~\Omega\) 4. zero
Subtopic:  EMF & Terminal Voltage |
 83%
From NCERT
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A voltmeter of resistance \(660~\Omega\) reads the voltage of a very old cell to be \(1.32\) V while a potentiometer reads its voltage to be \(1.44\) V. The internal resistance of the cell is:
1. \(30~\Omega\) 
2. \(60~\Omega\)
3. \(6~\Omega\)
4. \(0.6~\Omega\)

Subtopic:  EMF & Terminal Voltage |
 77%
From NCERT
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A current of \(2~\text{A}\) flows through a \(2~\Omega\) resistor when connected across a battery. The same battery supplies a current of \(0.5~\text{A}\) when connected across a \(9~\Omega\) resistor. The internal resistance of the battery is:
1. \(\frac{1}{3}~\Omega\)
2. \(\frac{1}{4}~\Omega\)
3. \(1~\Omega\)
4. \(0.5~\Omega\)

Subtopic:  EMF & Terminal Voltage |
 78%
From NCERT
AIPMT - 2011
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A set of '\(n\)' equal resistors, of value '\(R\)' each, are connected in series to a battery of emf '\(E\)' and internal resistance '\(R\)'. The current drawn is \(I.\) Now, if '\(n\)' resistors are connected in parallel to the same battery, then the current drawn becomes \(10I.\) The value of '\(n\)' is:

1. \(10\) 2. \(11\)
3. \(20\) 4. \(9\)
Subtopic:  EMF & Terminal Voltage |
 74%
From NCERT
NEET - 2018
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For a cell, the terminal potential difference is \(2.2\) V when the circuit is open and reduces to \(1.8\) V when the cell is connected to the resistance of \(R = 5~\Omega\). The internal resistance of cell (\(r\)) is:
1. \(\frac{10}{9}~ \Omega\)
2. \(\frac{9}{10}~ \Omega\)
3. \(\frac{11}{9}~ \Omega\)
4. \(\frac{5}{9}~ \Omega\)

Subtopic:  EMF & Terminal Voltage |
 72%
From NCERT
AIPMT - 2002
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A student measures the terminal potential difference \(V\) of a cell (of emf \( E\) and internal resistance \(R\)) as a function of the current \(I\) flowing through it. The slope and intercept of the graph between \(V\) and \(I\), respectively, is equal to:
1. \(E\) and \(-r\)
2. \(-r\) and \(E\)
3. \(r\) and \(-E\)
4. \(-E\) and \(r\)
Subtopic:  EMF & Terminal Voltage |
 69%
From NCERT
AIPMT - 2009
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A battery has emf \(4\) V and internal resistance \(r\). When this battery is connected to an external resistance of \(2\) ohm, a current of \(1\) ampere flows in the circuit. How much current will flow if the terminals of the battery are connected directly?
1. \(1\) A 2. \(2\) A
3. \(4\) A 4. Infinite
Subtopic:  EMF & Terminal Voltage |
 66%
From NCERT
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A battery is charged at a potential of \(15\) V for \(8\) hours when the current flowing is \(10\) A. The battery on discharge supplies a current of \(5\) A for \(15\) hours. The mean terminal voltage during discharges is \(14\) V. The "Watt hour" efficiency of the battery is:
1. \(80\%\)
2. \(90\%\)
3. \(87.5\%\)
4. \(82.5\%\)

Subtopic:  EMF & Terminal Voltage |
 68%
From NCERT
AIPMT - 2004
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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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