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In the circuit shown below, the op-amp is ideal and Zener voltage of the diode is $\text{2.5 volts}$.

At the input, unit step voltage is applied, i.e. $v_{IN}\left ( t \right )=u\left ( t \right )$ $\text{volts}$. Also, at $\text{t = 0}$, the

voltage across each of the capacitors is zero.


The time $\text{t}$, in milliseconds, at which the output voltage $v_{OUT}$ crosses $\text{-10 V}$ is 

  1. $2.5$
  2. $5$
  3. $7.5$
  4. $10$
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