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Question

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:

A

f/4

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B

8f

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C

f/3

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D

f/2

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Solution

The correct option is A
f/4

$f = \frac{1}{2 π} \sqrt{\frac{1}{L C}}$

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