List of top Physics Questions on Phasor diagrams

In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. -The current in the circuit:
When an AC source of emf $e =E_0$ sin (100t) is connected across a circuit, the phase difference between the emf e and the current i in the circuit is observed to be $ \frac{\pi}{4}$ ahead, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C in series, find the relationship between the two elements.
The maximum amplitude of an amplitude-modulated wave is found to be 15V while its minimum amplitude is found to be 3V. The modulation index is:
Correct match for phasors of voltage and current for given elements is
a. Inductive phasors of voltage and current for given elements
b. Capacitive phasors of voltage and current for given elements
C. Resistive phasors of voltage and current for given elements