In a zener-regulated power supply a zene...

In a zener-regulated power supply a zener diode with `V_(Z)=6 ` volt is used for regulation. The load current is to be 4mA and the unregulated input is 10 volt. What should be the value of series resistor `R_(S)`, if the current through diode is five times the load current ?

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`R_s=167 Omega`

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