Match List I with List II (the phasor diagrams of List II are shown in the figure).
$$\begin{array}{|l|l|l|l|}\hline & \text{List I} & & \text{List II} \\ \hline \text{A.} & \text{Purely capacitive circuit} & \text{I.} & \text{Phasor diagram I} \\ \hline \text{B.} & \text{Purely inductive circuit} & \text{II.} & \text{Phasor diagram II} \\ \hline \text{C.} & \text{LCR series at resonance} & \text{III.} & \text{Phasor diagram III} \\ \hline \text{D.} & \text{LCR series circuit} & \text{IV.} & \text{Phasor diagram IV} \\ \hline \end{array}$$
Choose the correct answer from the options given below:
Answer: (A) A-I, B-IV, C-II, D-III
- Purely capacitive: current leads voltage by $90^\circ$ → I.
- Purely inductive: voltage leads current by $90^\circ$ → IV.
- LCR at resonance: current and voltage in phase → II.
- General LCR series circuit: voltage and current differ by some angle $\theta$ → III.
So A-I, B-IV, C-II, D-III.
Solution by Sreeraj P, M.Sc Physics