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The Voltage Source Inverter $(VSI)$ shown in the figure below is switched to provide a $50 Hz$, square-wave
ac output voltage $(vo)$ across an $R-L$ load. Reference polarity of $vo$ and reference direction of the output
current $i_o$ are indicated in the figure. It is given that $R$ = 3 $\Omega$, $L$ = 9.55 $mH$

In the interval when $v_0$< 0 and $i_0$> 0 the pair of devices which conducts the load current is

  1. $Q1, Q2$
  2. $Q3, Q4$
  3. $D1, D2$
  4. $D3, D4$
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