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Current Electricity — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsCurrent 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
Image
  • 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 $E=2 \mathrm{~V}$. Also $r=$ slope $=\frac{2}{5}=0.4 \Omega$

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