MHT CET · Physics · Alternating Current
When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit
- A is zero.
- B remains constant.
- C increases.
- D decreases.
Answer & Solution
Correct Answer
(C) increases.
Step-by-step Solution
Detailed explanation
Impedance in LR circuit,
\(\mathrm{Z}=\sqrt{\mathrm{R}^2+\mathrm{X}_{\mathrm{L}}{ }^2}\)
Impedance in LCR circuit,
\(Z=\sqrt{R^2+\left(X_L-X_C\right)^2}\)
\(\therefore \quad\) When capacitor is connected in series, \(Z\) decreases.
\(I=\frac{V}{Z} \Rightarrow I \propto \frac{1}{Z}\)
\(\therefore \quad\) When Z decreases, I increases.
\(\mathrm{Z}=\sqrt{\mathrm{R}^2+\mathrm{X}_{\mathrm{L}}{ }^2}\)
Impedance in LCR circuit,
\(Z=\sqrt{R^2+\left(X_L-X_C\right)^2}\)
\(\therefore \quad\) When capacitor is connected in series, \(Z\) decreases.
\(I=\frac{V}{Z} \Rightarrow I \propto \frac{1}{Z}\)
\(\therefore \quad\) When Z decreases, I increases.
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