Question

In a semiconductor diode, the forward voltage is changed from $0.5V$ to $0.7V$, then the forward current changes by 1mA. The forward resistance of the diode junction is :

• A. $100\Omega$
• B. $50\Omega$
• C. $200\Omega$
• D. $250\Omega$

Answer 1

Answer: (C)

$200\Omega$

$R=\frac{\Delta V}{\Delta l}$

$\Delta V=0.7-0.5V$

$\Delta l=1\times {10}^{-3}A$

$\therefore R=\frac{0.7-0.5}{1\times {10}^{-3}}=200\Omega$