Cell Combination (series)
n identical cells each emf E and internal resistance r in series (external R). Total emf and internal resistance?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More current electricity Practice Questions
Engineers relate the current density inside a conductor to the local electric field through the mate...
Engineers relate the current density inside a conductor to the local electric field through the mate...
Three identical cells, each with internal resistance 0.6 ohm, are connected in parallel to reduce th...
Three identical cells, each with internal resistance 0.6 ohm, are connected in parallel to reduce th...
A battery of emf 12 volts and internal resistance 3 ohm drives a variable load resistor, so for what...
A battery of emf 12 volts and internal resistance 3 ohm drives a variable load resistor, so for what...
An electric heater rated to carry 5 amperes operates across a 220 volt mains supply in a kitchen, so...
An electric heater rated to carry 5 amperes operates across a 220 volt mains supply in a kitchen, so...
Current passes through a 20 ohm resistor at 2 amperes for 5 minutes in a demonstration, so how much ...
Current passes through a 20 ohm resistor at 2 amperes for 5 minutes in a demonstration, so how much ...
Four identical cells, each of emf 1.5 volts and internal resistance 0.2 ohm, are connected in series...
Four identical cells, each of emf 1.5 volts and internal resistance 0.2 ohm, are connected in series...
While measuring a battery on a test bench, its terminal voltage drops from 12 volts on open circuit ...
While measuring a battery on a test bench, its terminal voltage drops from 12 volts on open circuit ...
A cell of emf 6 volts and internal resistance 0.5 ohm is connected to an external resistor of 2.5 oh...
A cell of emf 6 volts and internal resistance 0.5 ohm is connected to an external resistor of 2.5 oh...
Two resistors of 6 ohm and 3 ohm are wired side by side between the same two nodes of a circuit, so ...
Two resistors of 6 ohm and 3 ohm are wired side by side between the same two nodes of a circuit, so ...
At a junction in a network, currents of 5 A and 3 A enter while currents of 4 A and I leave through ...
At a junction in a network, currents of 5 A and 3 A enter while currents of 4 A and I leave through ...
A potentiometer is often preferred over a voltmeter for measuring the emf of a cell accurately, so w...
A potentiometer is often preferred over a voltmeter for measuring the emf of a cell accurately, so w...
In a balanced Wheatstone bridge the galvanometer shows no deflection, so which relation among the fo...
In a balanced Wheatstone bridge the galvanometer shows no deflection, so which relation among the fo...
About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- cell combination (series)
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Etotal=nE,rtotal=nr
- EMF in Series: When cells are connected in series, their EMFs add up to push charge through the circuit effectively. So, Etotal=E+E+⋯=nE.
- Resistance in Series: The internal resistances also act in series along the same path. Thus, rtotal=r+r+⋯=nr.
- Total Circuit Resistance: If an external resistor R is connected, the net resistance is R+nr.
- Current Formula: I=R+nrnE.
- Conclusion: For the battery itself, the equivalent EMF is nE and internal resistance is nr.
This hard difficulty physics question is from the chapter current electricity, covering the topic of cell combination (series). It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse current electricity questions on RankGuru.