The terminal voltage of the battery, whose emf is $$10~\text V$$ and internal resistance  $$1~\Omega,$$ when connected through an external resistance of $$4~\Omega$$ as shown in the figure is:

 1 $$6~\text V$$ 2 $$8~\text V$$ 3 $$10~\text V$$ 4 $$4~\text V$$
Subtopic:  EMF & Terminal Voltage |
64%
From NCERT
NEET - 2024
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A cell of emf  $$4~\text{V}$$ and internal resistance $$0.5~\Omega$$ is connected to a $$7.5~\Omega$$ external resistance. The terminal potential difference of the cell is:
 1 $$3.75~\text{V}$$ 2 $$4.25~\text{V}$$ 3 $$4~\text{V}$$ 4 $$0.375~\text{V}$$
Subtopic:  EMF & Terminal Voltage |
71%
From NCERT
NEET - 2022
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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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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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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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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 $$\dfrac{10}{9}~ \Omega$$ 2 $$\dfrac{9}{10}~ \Omega$$ 3 $$\dfrac{11}{9}~ \Omega$$ 4 $$\dfrac{5}{9}~ \Omega$$
Subtopic:  EMF & Terminal Voltage |
72%
From NCERT
AIPMT - 2002
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