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Alternating Current — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
MCQ
In $\text{LCR}$ series $AC$ circuit.
  • ✓
    If $R$ is increased current will decrease.
  • B
    If $L$ is increased current will decrease.
  • C
    If $C$ is increased current will increase.
  • D
    If $C$ is increased current will decrease.
✓

Answer

Correct option: A.
If $R$ is increased current will decrease.

$\text{I}=\frac{\text{V}}{\text{Z}}=\frac{\text{V}}{\sqrt{\text{R}^2\Big(\omega\text{L }\sim}\frac{1}{\omega\text{C}}\Big)^2}$
By increasing $R$, current will definitely decrease by change in $L$ or $C$, current may increase or decrease.

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