Question: 21. A variable capacitor in a circuit with a 120-V, 60-Hz source initially has a capacitance of 0.25 F. The capacitance is then

21. •• A variable capacitor in a circuit with a 120-V, 60-Hz source initially has a capacitance of 0.25 μF. The capacitance is then increased to 0.40 μF.

(a) What is the percentage change in the capacitive reactance?

(b) What is the percentage change in the current in the circuit?

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