Question: a An RLC series circuit is in resonance Which one

(a) An RLC series circuit is in resonance. Which one of the following can you change without upsetting the resonance: (1) resistance, (2) capacitance, (3) inductance, or (4) frequency?
(b) A resistor, an inductor, and a capacitor have values of 500-Ω, 500 mH, and 3.5μF, respectively. They are connected in series to a power supply of 240 V with a frequency of 60 Hz. What values of resistance and inductance would be required for this circuit to be in resonance (without changing the capacitor)?

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