A battery of emf \( 12\,\mathrm{V} \) and internal resistance \( 3\,\Omega \) is connected to an external resistor. If the current in the circuit is \( 0.6\,\mathrm{A} \), the voltage across the external resistor will be
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \( 10.2\,\mathrm{V} \)
The voltage across the external resistor is the terminal voltage of the battery, which is the emf minus the potential drop across the internal resistance.
\( \displaystyle V = \varepsilon - I\,r \)
\( \displaystyle V = 12 - (0.6 \times 3) = 12 - 1.8 = 10.2\,\mathrm{V} \)
Note: NTA picked this question from an NCERT (2026-27) exercise and changed the figures. Do not ignore NCERT while practising numericals.
NCERT (2026-27):
Exercises – …
