Question

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

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

Answer 1

Answer: (C)

$R =\Delta l \Delta V$
$\Delta V =0.7-0.5 V$
$\Delta l =1 \times 10-3 A$
$\therefore R =1 \times 10-30.7-0.5=200 \Omega$