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STD 12 -7. Alternating current — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 -7. Alternating current4 Marks
MCQ
In a simple $L-R$ circuit with $A.C$. source the potential difference at any instant across inductor and resistance are $V_L$ and $V_R$ respectively and $A.C.$ souree has potential difference $V_{Ac}$ at the same instant. Then
  • A
    $V_L^2 + V_R^2 = V_{AC}^2$
  • ✓
    ${V_L} + {V_R} = {V_{AC}}$
  • C
    $V_L^2 - V_R^2 = V_{AC}^2$
  • D
    $V_L^3 + V_R^3 = V_{AC}^3$
✓

Answer

Correct option: B.
${V_L} + {V_R} = {V_{AC}}$
b
Instantaneous sum of potential difference
$V_R = V_L + V_C$

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