Two Zener diode ( A and B) having breakdown voltage of 6V and 4V respectively, are connected. The voltage V0 variation with i/p voltage linearly increasing with time is given by: (V_{input }=0) (V at t= 0)


Option: 1
Option: 2
Option: 3
Option: 4

Answers (1)

Till input voltage Reaches 4V No zener is in Breakdown Region So $\mathrm{V}_{0}=\mathrm{V}_{\mathrm{i}}$ Then Now when $\mathrm{V}_{\mathrm{i}}$ changes between $4V to $6V}$One Zener with 4V will Breakdown are P.D. across This zener will become constant and Remaining Potential will drop. acro Resistance in series with 4V 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 $\mathrm{V}_{0}$ and t. will be

We have to Assume some resistance in series with source

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