WBJEE · Physics · Semiconductors
A Zener diode having break down voltage \(\mathrm{Vz}=6 \mathrm{~V}\) is used in a voltage regulator circuit as shown in the figure. The minimum current required to pass through the Zener to act as a voltage regulator is \(10 \mathrm{~mA}\) and maximum allowed current through Zener is \(40 \mathrm{~mA}\). The maximum value of \(R_{\mathrm{s}}\) for Zener to act as a voltage regulator is
- A \(100 \Omega\)
- B \(400 \Omega\)
- C \(0.4 \Omega\)
- D \(950 \Omega\)
Answer & Solution
Correct Answer
(B) \(400 \Omega\)
Step-by-step Solution
Detailed explanation
Minimum current \(=10 \mathrm{~mA}\left(\mathrm{I}_{\mathrm{L}}=0\right)\) \[ \mathrm{R}_{\mathrm{S}}=\frac{\mathrm{V}}{\mathrm{l}}=\frac{4 \mathrm{~V}}{10 \mathrm{~mA}}=400 \Omega \]
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