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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
For a cell, the graph between the potential difference $(V) $ across the terminals of the cell and the current $(I)$ drawn from the cell is shown in the figure. The $e.m.f.$ and the internal resistance of the cell are
  • A
    $2\,V$,   $0.5\,\Omega $
  • ✓
    $2\,V$,   $0.4\,\Omega $
  • C
    $ > 2\,V$,   $0.5\,\Omega $
  • D
    $ > 2\,V$,   $0.4\,\Omega $
✓

Answer

Correct option: B.
$2\,V$,   $0.4\,\Omega $
b
E.m.f. is the value of voltage, when no current is drawn from the circuit so $E = 2\,V$.

Also $r = $ slope $=\frac{2}{5} = 0.4\,\Omega $

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