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GATE ECE 2011 | Question-32

For the $\text{BJT Q}_1$ in the circuit shown below, $\beta=\infty, \mathrm{V}_{\mathrm{BEon}}=0.7 \mathrm{V}, \mathrm{V}_{\mathrm{CEsat}}=0.7 \mathrm{V}$. The switch is initially closed. At time $t=0$, the switch is opened. The time $t$ at which $\mathrm{Q}_1$ leaves the active region is

  1. $10 \mathrm{~ms}$
  2. $25 \mathrm{~ms}$
  3. $50 \mathrm{~ms}$
  4. $100 \mathrm{~ms}$
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