The switch S is the circuit of the figure given below is

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The switch S is the circuit of the figure given below is initially closed. It is opened at time t = 0. You may neglect the Zener diode forward voltage drops. What is the behaviour of V_OUT for t > 0?

1. It makes a transition from – 5 V to + 5 V at t = 12.98 μs
2. It makes a transition from – 5 V to + 5 V at t = 2.57 μs
3. It makes a transition from + 5 V to – 5 V at t = 12.98 μs
4. It makes a transition from + 5 V to – 5 V at t = 2.57 μs

Correct Option: D

It is a limited circuit
It makes a transition from + 5V to – 5V

20 ( 1 - e^{– t / RC} ) = 5 ×	100	= Voltage across 100 kΩ
	110

RC = 0.01 × 10^{– 6} × 10³
∴ t = 2.57 μs