A) \[f/4\]
B) \[8f\]
C) \[f/2\sqrt{2}\]
D) \[f/2\]
Correct Answer: C
Solution :
In a series LC circuit, frequency of LC oscillations is given by \[f=\frac{1}{2\pi \sqrt{LC}}\]or \[f\propto \frac{1}{\sqrt{LC}}\] \[\frac{{{f}_{1}}}{{{f}_{2}}}=\sqrt{\frac{{{L}_{2}}{{C}_{2}}}{{{L}_{1}}{{C}_{1}}}}\] Given, \[{{L}_{1}}=L,{{C}_{1}}=C,{{L}_{2}}=2L,{{C}_{2}}=4C,{{f}_{1}}=f\] \[\frac{f}{{{f}_{2}}}=\sqrt{\frac{2L\times 4C}{LC}}=\sqrt{8}\Rightarrow {{f}_{2}}=\frac{f}{2\sqrt{2}}\]
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