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G5 · Electrical Principles

General · correct answers only, in question-pool order.

G5A01

What happens when inductive and capacitive reactance are equal in a series LC circuit?

AnswerThe circuit is resonant and its impedance becomes very low.

At series resonance, equal and opposite reactances cancel, leaving mainly the circuit resistance.

G5A02

AnswerOpposition to alternating current caused by capacitance or inductance.

Unlike resistance, reactance depends on frequency and arises from energy storage in electric or magnetic fields.