✓ Board-verified
Physics · 2025 · 2 marks
CBSE 2025 · Region 6 · Set 2 · Q17
A cell of emf E and internal resistance r is connected to an external variable resistance R. Plot a graph showing the variation of terminal voltage V…
A cell of emf $\displaystyle E$ and internal resistance $\displaystyle r$ is connected to an external variable resistance $\displaystyle R$. Plot a graph showing the variation of terminal voltage V of the cell as a function of current I, supplied by the cell. Explain how the emf of the cell and its internal resistance can be found from it.
Marking-scheme solution
Graph showing the variation of terminal voltage V of the cell as a function of current I.
All Current Electricity questions2025 question paperNCERT solutions: Current ElectricityPractice Current Electricity →
More from Current Electricity
- A steady current flows through a metallic wire whose area of cross-section increases continuously from one end of the wire to the other. The…2023
- (i) Define mobility of electrons. Give its SI units. (ii) A steady current flows through a wire AB, as shown in the figure. What happens to the…2023
- What is the order of magnitude of drift velocity of electrons in a conductor? Deduce the relation between the current flowing through a conductor and…2026
- 'Current is a scalar quantity, although we represent current with an arrow.' Explain. Derive the balance condition of a Wheatstone Bridge.2026
- The number of electrons flowing through a conductor per second is 3 · 3 × 10^19. The current flowing through the conductor is:2023
- A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the…2026
- Define current density and relaxation time. Derive an expression for resistivity of a conductor in terms of number density of charge carriers in the…2023
- A battery of e. m. f. 12 V and internal resistance 0.5 Ω is connected to a 9.5 Ω resistor through a key. The ratio of potential difference between…2025
CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.