Q18 of 31 Page 43

In series LCR circuit, the plot of Imax vs ω is shown in Fig 7.3. Find the bandwidth and mark in the figure.


The bandwidth is from ω1 to ω2 where ω1 and ω2 are the lowest and highest angular frequencies respectively. At these frequencies, current is given by:





We have, and


The bandwidth is:



More from this chapter

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16

Study the circuits (a) and (b) shown in Fig 7.2 and answer the following questions.


(a) Under which conditions would the rms currents in the two circuits be the same?


(b) Can the rms current in circuit (b) be larger than that in (a)?


 17

Can the instantaneous power output of an ac source ever be negative? Can the average power output be negative?

 19

The alternating current in a circuit is described by the graph shown in Fig 7.4. Show rms current in this graph.


 20

How does the sign of the phase angle ϕ, by which the supply voltage leads the current in an LCR series circuit, change as the supply frequency is gradually increased from very low to very high values.