# 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

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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