The storage battery of a car has an emf of 10 V. If the internal resistance of the battery is \( 0.2\,\Omega \), then the maximum current that can be drawn from the battery is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 50 A
The current drawn from a cell with external resistance \( R \) is \( I = E/(R + r) \). It is largest when \( R = 0 \), that is when the battery is short-circuited, and then only the internal resistance limits it.
\( \displaystyle I_{\max} = \frac{E}{r} = \frac{10\,\mathrm{V}}{0.2\,\Omega} = 50\,\mathrm{A} \)
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 – …
