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(A) Plot V-I characteristics for an illu...

(A) Plot V-I characteristics for an illuminated photo diode under reverse bias for three different illumination intensities `I_1 gt I_2 gt I_3` . (B) In a zener regulated power supply, a zener diode with V_2 = 6 V is used for regulation. the load current should be 4.0 mA and zener current is five times the load current for unregulated input of 10 V. Find the series resistor `R_3` used in the power supply.

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