Question

Phase diagram of series $AC$ circuit is shown in figure. Then

• A. The circuit must be containing resistor and capacitor only.
• B. The circuit must be containing resistor and inductor only.
• C. The circuit must be containing all three elements $L,C$ and $R$
• D. The circuit cannot have only capacitor and inductor.

Answer 1

The correct option is D The circuit cannot have only capacitor and inductor.

In case of only capacitor and inductor phase difference between current and voltage should be ${90}^o$, hence resistance must be present.

As the current is lagging the voltage, inductive reactance must be dominating, however, we can not say that capacitive reactance must be non zero.

Hence, option D is correct answer.