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ƒ r<br />

14. For the parallel resonant network of Fig. 20.53:<br />

a. Calculate f s.<br />

b. Determine Q l using f � f s. Can the approximate<br />

approach be applied?<br />

c. Determine f p and f m.<br />

d. Calculate X L and X C using f p. How do they compare?<br />

e. Find the total impedance at resonance ( f p).<br />

f. Calculate V C at resonance ( f p).<br />

g. Determine Q p and the BW using f p.<br />

h. Calculate I L and I C at f p.<br />

15. Repeat Problem 14 for the network of Fig. 20.54.<br />

16. For the network of Fig. 20.55:<br />

a. Find the value of X C at resonance ( f p).<br />

b. Find the total impedance Z Tp at resonance ( f p).<br />

c. Find the currents I L and I C at resonance ( f p).<br />

d. If the resonant frequency is 20,000 Hz, find the value<br />

of L and C at resonance.<br />

e. Find Q p and the BW.<br />

I = 5 mA ∠0°<br />

Z Tp<br />

17. Repeat Problem 16 for the network of Fig. 20.56.<br />

I = 80 mA ∠0°<br />

Z Tp<br />

R s<br />

FIG. 20.55<br />

Problem 16.<br />

R s<br />

1 k�<br />

450 �<br />

FIG. 20.56<br />

Problem 17.<br />

I 10 mA<br />

R s = ∞ �<br />

I 2 mA<br />

R s = ∞ �<br />

R l<br />

X L<br />

R l<br />

X L<br />

20 �<br />

I L<br />

100 �<br />

2 �<br />

I L<br />

30 �<br />

Z Tp<br />

R l<br />

FIG. 20.53<br />

Problem 14.<br />

Z Tp<br />

L 0.5 mH<br />

R l<br />

4 �<br />

L 0.1 mH<br />

FIG. 20.54<br />

Problem 15.<br />

X C<br />

X C<br />

8 �<br />

I C<br />

PROBLEMS ⏐⏐⏐ 931<br />

I C<br />

C<br />

C<br />

+<br />

30 nF VC –<br />

+<br />

2 �F VC –

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