
For an circuit driven with a voltage of amplitude and frequency the current exhibits resonance. The quality factor is given by:


Important Questions on Alternating Current

Hysteresis loops for two magnetic materials and are given below :
These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use :

An circuit is equivalent to a damped pendulum. In an circuit the capacitor is charged to and then connected to the and as shown below:
If a student plots graphs of the square of maximum charge on the capacitor with time for two different values of then which of the following represents this graph correctly? (Plots are schematic and not drawn to scale)



In a series circuit with an ac source of frequency The average electric field energy stored in the capacitor and average magnetic energy stored in the coil are respectively. The current in the circuit is . Then find:
(a) Capacitance of capacitor
(b) Inductance of inductor.
(c) The sum of rms potential difference across the three elements.


