alleryThe impedance of a series LCR circuit at resonance equals:
AC
BZ
CR
DL
Answer & Solution
Correct answer: C. R
1. The reactances cancel at the resonant frequency.
2. Only the resistive part is left in the expression.
3. So the impedance equals R there.
4. The answer is R.
_Source: syllabus Physics, Ch 7 'Alternating Current'_
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