Cell Emf Hard
EMF of cell best defined as:
Select the correct option:
Solution
Work done per unit charge taking charge from one terminal to other inside cell
The Electromotive Force (EMF, E) of a cell is the potential difference between its terminals when no current is drawn (open circuit).
- Physically, E=QW, where W is the work done by chemical forces to move a charge Q within the cell from one terminal to the other against the electrostatic force.
- When a current I flows, the terminal voltage V=E−Ir, where r is internal resistance.
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- cell emf hard
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Work done per unit charge taking charge from one terminal to other inside cell
The Electromotive Force (EMF, E) of a cell is the potential difference between its terminals when no current is drawn (open circuit).
- Physically, E=QW, where W is the work done by chemical forces to move a charge Q within the cell from one terminal to the other against the electrostatic force.
- When a current I flows, the terminal voltage V=E−Ir, where r is internal resistance.
This hard difficulty physics question is from the chapter current electricity, covering the topic of cell emf hard. It appeared in the 2025 exam.
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