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Which of the following indicates 2nd harmonic distortion in power amplifier?

A. $$\frac{{\left| {{{\text{A}}_2}} \right|}}{{\left| {{{\text{A}}_1}} \right|}}$$

B. $$\frac{{\left| {{{\text{A}}_3}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$

C. $$\frac{{\left| {{{\text{A}}_4}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$

D. $$\frac{{\left| {{{\text{A}}_1}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$

Answer: Option A


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