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A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate voltage fluctuating between 3 V and 10 V. The value of resistace R s for safe operation of diode will be

1. 10 
2. 12 
3. 13.3 
4. 13 

Correct answer: 10 

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