18. A coil of resistance 20 Ω and inductance of 300 mH is connected in parallel with a capaci-
tance of 200 µF. The combination is connected across 200 V, variable frequency power sup-
ply. At what frequency, will the parallel circuit resonate and what would be the current at
resonance? [Ans. 20.5 Hz, 2.66 A]
19. Calculate the value of R in the circuit shown in the Figure 3.58 such that the circuit will
resonate.
R
10 Ωj10 Ω
−j2
V,
f
Figure 3.58
[Ans.R= 6 Ω]
20. Calculate the half power frequencies of a series resonance circuit in which the resonant
frequency is 150 kHz and bandwidth 75 kHz. [Ans.
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