NCERT Physics Class 12 Exemplar Ch 7 Alternating Current Part 2

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18 In series LCR circuit, the plot of is shown in Figure. Find the bandwidth and mark in the figure.

LCR circuit- I(max )- Find bandwidth

LCR Circuit- I(max )- Find Bandwidth

Ans:

  • Bandwidth corresponds to frequencies at which.

  • It is shown in the Fig.

LCR circuit- plot of I(max )

LCR Circuit- Plot of I(max )

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

Alternating current rms graph

Alternating Current Rms Graph

Ans:

(Shown in Fig. by dotted line)

Alternating current described by the graph

Alternating Current Described by the Graph

20 How does the sign of the phase angle , 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.

Ans:

  • From negative to zero to positive; zero at resonant frequency

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