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In a Zener regulated power supply a Zene...

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

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`R_s=167 Omega`
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