Question 176: AC fundamentals

Question

For a series LCR circuit, I vs $$\omega$$ curve is shown :
(a) To the left of $$\omega$$r, the circuit is mainly capacitive.
(b) To the left of $$\omega$$r, the circuit is mainly inductive.
(c) At $$\omega$$r, impedance of the circuit is equal to the resistance of the circuit.
(d) At $$\omega$$r, impedance of the circuit is 0.
  
Choose the most appropriate answer from the options given below :

Accepted Answer

We know that $${X_C} = {1 \over {\omega C}}$$ and $${X_L} = \omega L$$
Also, at $$\omega  = {\omega _r}:{X_L} = {X_C}$$
$$\Rightarrow$$ For $$\omega  < {\omega _r}$$ : capacitive
and $$\omega  = {\omega _r}:z = \sqrt {{R^2} + {{({X_L} - {X_C})}^2}}  = R$$

Answer

(a) and (d) only.

Answer

(b) and (d) only.

Answer

(a) and (c) only.

Answer

(b) and (c) only.

AC fundamentals

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