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Q.

A 10 V Zener diode along with a series resistance is connected across 40 V supply. Calculate the minimum value of the resistance regulated, if the maximum Zener current is 500 mA.

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a

50

b

60

c

70

d

80

answer is B.

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Detailed Solution

Vi/p=40V, iz=500mA=500×10−3A=0.5A, Vz=10V , Rs=?If iz is max iL is zero      i=iz+iL=0.5+0=0.5AAlso,   i=Vi−VzRs  ⇒Rs=Vi−Vzi     ⇒Rs=40−100.5=300.5=3012=60Ω
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