A battery has e.m.f. 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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In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 ohm. The other resistances are shown in the figure. The potential difference VAVB is :

(1) 6 V

(2) 4 V

(3) 2 V

(4) –2 V

Subtopic:  EMF & Terminal Voltage |
 56%
From NCERT
PMT - 1997
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In the circuit, the potential difference across PQ will be nearest to 

(1) 9.6 V

(2) 6.6 V

(3) 4.8 V

(4) 3.2 V

Subtopic:  EMF & Terminal Voltage |
 71%
From NCERT
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The e.m.f. of a cell is E volts and internal resistance is r ohm. The resistance in external circuit is also r ohm. The p.d. across the cell will be 

(1) E/2

(2) 2E

(3) 4E

(4) E/4

Subtopic:  EMF & Terminal Voltage |
 82%
From NCERT
PMT - 1985
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The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell)

(1) E

(2) E/2

(3) Zero

(4) E/3

Subtopic:  EMF & Terminal Voltage |
 70%
From NCERT
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The potential difference in open circuit for a cell is 2.2 volts. When a 4-ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be :

(1) 1 ohm

(2) 0.2 ohm

(3) 2.5 ohm

(4) 0.4 ohm

Subtopic:  EMF & Terminal Voltage |
 71%
From NCERT
PMT - 1984
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A cell whose e.m.f. is 2 V and internal resistance is 0.1 Ω, is connected with a resistance of 3.9 Ω. The voltage across the cell terminal will be :

(1) 0.50 V

(2) 1.90 V

(3) 1.95 V

(4) 2.00 V

Subtopic:  EMF & Terminal Voltage |
 71%
From NCERT
AIIMS - 2001
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A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if 

(1) R = r

(2) R < r

(3) R > r

(4) None of these

Subtopic:  EMF & Terminal Voltage |
From NCERT
PMT - 1982
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A battery of e.m.f. 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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Consider the circuit given here with the following parameters E.M.F. of the cell = 12 V. Internal resistance of the cell = 2 Ω. Resistance R = 4 Ω. Which one of the following statements is true.

(1) Rate of energy loss in the source is = 8 W

(2) Rate of energy conversion in the source is 16 W

(3) Power output in R is = 8 W

(4) Potential drop across R is = 16 V

Subtopic:  EMF & Terminal Voltage |
From NCERT
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