In a Zener regulated power supply a Zene...

In a Zener regulated power supply a Zener diode with `V_(Z)=6.0V` is used for regulation. The load current is to be 4.0 mA and the unregulated input is 10.0V. What should be the value of series resistor `R_(S)`?

`416.7Omega`

`250Omega`

`6xx10^(-3)Omega`

`167Omega`

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