MHT CET · Physics · Semiconductors
In the circuit diagram shown in figure, the current through the zener diode is
- A 30 mA
- B 17.5 mA
- C 15 mA
- D \(\quad 12.5 \mathrm{~mA}\)
Answer & Solution
Correct Answer
(B) 17.5 mA
Step-by-step Solution
Detailed explanation
Potential difference across \(1200 \Omega\) resistor \(\mathrm{V}_{1200 \Omega}=15 \mathrm{~V}\)
\(\therefore \quad\) current across \(1200 \Omega\) resistor,
\(\mathrm{I}_{1200 \Omega}=\frac{15}{1200} \quad A=12.5 \mathrm{~mA}\)
Potential difference across \(300 \Omega\) resistor,
\(V_{300 \Omega}=24-15=9 \mathrm{~V}\)
\(\therefore \quad\) Current across \(300 \Omega\) resistor,
\(I_{300 \Omega}=\frac{9}{300} A=30 \mathrm{~mA}\)
\(\therefore \quad\) Current through zener diode,
\(I_z=30-12.5=17.5 \mathrm{~mA}\)
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