To reduce the reasonant frequency in an LCR series circuit with a g...

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To reduce the reasonant frequency in an LCR series circuit with a generator
\( \mathrm{P} \)
(a) the generator frequency should be reduced.
W
(b) another capacitor should be added in parallel to the first.
(c) the iron core of the inductor should be removed.
(d) dielectric in the capacitor should be removed.
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