When either L or C is increased ,the resonant frequency of the RLC series circuit :
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains same
- D. Becomes zero
Explanation
The resonant frequency of an RLC series circuit is:fo=1/2pisqrt {LC}Here, is inductance and is capacitance.If L increases, the denominator becomes larger → thefrequency becomes smaller.If C increases, the denominator also becomes larger → thefrequency again decreases.So, increasing either or reduces the resonant frequency.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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