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Two magnetically uncoupled inductive coils have $Q$ factors $q_1$ and $q_2$ at the chosen operating
frequency. Their respective resistances are $R_1$ and $R_2$. When connected in series, their effective
$Q$ factor at the same operating frequency is

  1. $q_1R_1+q_2R_2$
  2. $q_1/R_1+q_2/R_2$
  3. $(q_1R_1+q_2R_2)/(R_1+R_2)$
  4. $q_1R_2+q_2R_2$
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