Series Combination of Cells
Trending Questions
Q. Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is


- r1−r2
- r1+r2
- r12+r2
- r12−r2
Q. 24 cells of each emf 4V are connected in series. Among them if 5 cells are connected wrongly, the effective emf of the combination is
- 18V
- 56V
- 24V
- 4V
Q.
Which of the following statements is correct about the circuit shown in figure where 1 ohm and 0.5 ohm are the internal resistances of the 6 V and 12 V batteries respectively?
- If a voltmeter is connected across the 6 V battery it will read 5 V
- The potential at point Q is +0.5 V
- The potential at point P is 6 V
- If a voltmeter is connected across the 6 V battery it will read 7 V
Q. A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to this current, the temperature of the wire is raised by ΔT in time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of wire is raised by same amount ΔT in the same time t. The value of N is
- 8
- 9
- 4
- 6
Q. The magnitude and direction of the current in the circuit shown will be


- 1.0 A from b to a through e
- 1.0 A from a to b through e
- 73 A from a to b through e
- 73 A from b and a through e
Q. Find the current through 4 Ω resistor in the circuit shown.


- 0A
- 619A
- 196A
- 0.4A
Q. Two batteries A and B each of emf 2 volt are connected in series to external resistance R=1Ω. Internal resistance of A and B are 1.9Ω and 0.9Ω respectively. What is the potential difference between the terminals of battery A ?


- 2 V
- 3.8 V
- 0
- None of these
Q. In a mixed grouping of identical cells 5 rows are connected in parallel and each row contains 10 cells. This combination send a current i through an external resistance of 20Ω. If the emf and internal resistance of each cell is 1.5 volt and 1Ω respectively then the value of i is
- 0.14 A
- 0.25 A
- 0.75 A
- 0.68 A
Q. A group of N cells whose emf varies directly with the internal resistance as per the equation EN=1.5 rN are connected as shown in the following figure. The current i in the circuit is


- 0.51 amp
- 5.1 amp
- 0.15 amp
- 1.5 amp
Q. With reference to the circuit as shown in figure, what is the current maintained?


- 1.5A
- 15A
- 0.67A
- 6.67A