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3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across $\mathrm{A}$ and $B$, their readings are $V_1, V_2$ and $V_3$. Choose the correct option.
  • A
    $V_1=V_2$
  • B
    $V_1 \neq V_3-V_2$
  • C
     $V_1+V_2>V_3$
  • ✓
     $V_1+V_2=V_3$
✓

Answer

Correct option: D.
 $V_1+V_2=V_3$
d
From $KVL$,

$v_1+v_2-v_3=0 \Rightarrow \mathrm{V}_1+\mathrm{V}_2=\mathrm{V}_3$

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