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  4. Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in athe circuit below. The output voltage V 0 variation with input voltage linearly increasing with time, is given by: ( V text input =0 V . at t =0 ) (figures are qualitative)

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Q. Two Zener diodes (A and B) having breakdown voltages of $6 V$ and $4 V$ respectively, are connected as shown in athe circuit below. The output voltage $V _{0}$ variation with input voltage linearly increasing with time, is given by : $\left( V _{\text {input }}=0 V \right.$ at $t =0$ ) (figures are qualitative)Physics Question Image

JEE MainJEE Main 2020Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Till input voltage Reaches $4 V$ No zener is in Breakdown Region So $V _{0}= V _{ i }$ Then Now when $V _{ i }$ changes between $4 V$ to $6 V$ One Zener with $4 V$ will Breakdown are P.D. across This Zener will become constant and Remaining Potential will drop. aero
Resistance in series with $4 V$ Zener.
Now current in circuit increases Abruptly and source must have an internal resistance due to which. Some potential will get drop across the source also so correct graph between $V _{0}$ and $t$. will be
image
We have to Assume some resistance in series with source.