Alternating Current - Result Question 39

41. A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be

[2006]

(a) 8f

(b) f/22

(c) f/2

(d) f/4

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Answer:

Correct Answer: 41. (b)

Solution:

  1. (b) We know that frequency of electrical oscillation in L.C. circuit is

f=12π1LC

Now, Misplaced &

f=12π12L.4C=12π1LC×122

f=122×f



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