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 cell having an emf $$\varepsilon$$ and internal resistance $$r$$ is connected across a variable external resistance $$R$$. As the resistance $$R$$ is increased, the plot of potential difference $$V$$ across $$R$$ is given by:

 1 2 3 4
Subtopic:  EMF & Terminal Voltage |
61%
From NCERT
AIPMT - 2012
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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 $$\dfrac{1}{3}~\Omega$$ 2 $$\dfrac{1}{4}~\Omega$$ 3 $$1~\Omega$$ 4 $$0.5~\Omega$$
Subtopic:  EMF & Terminal Voltage |
78%
From NCERT
AIPMT - 2011
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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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In the circuit shown, the current through the 4$\mathrm{\Omega }$ resistors is 1 A when the points P and M are connected to a DC voltage source. The potential difference between the points M and N is:

1.  1.5 V

2.  1.0 V

3.  0.5 V

4.  3.2 V

Subtopic:  Combination of Resistors | EMF & Terminal Voltage |
60%
From NCERT
AIPMT - 2008
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