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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
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- 8f
- f/2√2
- f/2
- f/4
Correct Option: B
We know that frequency of electrical oscillation in L.C. circuit is
ƒ = (1/2π)√(1/LC)
Now, L = 2L & C = 4C
ƒ' = (1/2π)√(1/2L.4C) = (1/2π) √(1/LC) × (1/2√2)
| ⇒ ƒ' = | 1 | × ƒ |
| 2√2 |
