Q158 / 160 · TS EAMCET 2016 · Physics
The change in current through a junction diode is $12 \mathrm{~mA}$ when the forward bias voltage is changed by $0.6 \mathrm{~V}$. The dynamic resistance is
- Correct answerA$500 \Omega$
- B$300 \Omega$
- C$150 \Omega$
- D$250 \Omega$
Solution
Change in current through junction diode,
$$
\Delta=1.2 \mathrm{~mA}=1.2 \times 10^{-3} \mathrm{~A}
$$
Change in forward bias voltage, $\Delta V=0.6 \mathrm{~V}$
Dynamic resistance,
$$
R_{\text {dyn. }}=\frac{\Delta V}{\Delta l}=\frac{0.6}{1.2 \times 10^{-3}}=500 \Omega
$$
Hence, the correct answer is option: 'A'.