Q. If the forward voltage in a semiconductor diode is changed from 0.5 V to 0.7 V, then the forward current changes by 1.0 mA. The forward resistance of diode junction will be
A) $100\ \Omega$
B) $120\ \Omega$
C) $200\ \Omega$
D) $240\ \Omega$
Explanation
(c) Forward resistance
$= \frac{\mathrm{\Delta}V}{\mathrm{\Delta}I} = \frac{0.7 - 0.5}{1.0 \times 10^{- 3}} = 200\Omega.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.