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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
When current supplied by a cell to a circuit is $0.3 \,A$, its terminal potential difference is $0.9 \,V$. When the current supplied becomes $0.25 \,A$, its terminal potential difference becomes $1.0 \,V$. The internal resistance of the cell is ............ $\Omega$
  • A
    $0.5$
  • ✓
    $2$
  • C
    $1.2$
  • D
    $1$
✓

Answer

Correct option: B.
$2$
b
(b)

$V=E-ir$

$0.9=E-0.3 r$

$1=E-0.25 r$

$0.1=0.05 r$

$r=2 \Omega$

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