Q. When a silicon $PN$ junction is in forward biased condition with series resistance, it has knee voltage of $0.6\ V$. Current flow in it is $5\ mA$, when $PN$ junction is connected with $2.6V$ battery, the value of series resistance is
A) 100 $\Omega$
B) 200 $\Omega$
C) 400 $\Omega$
D) 500 $\Omega$
Explanation
(c) $R = \frac{(2.6 - 0.6)}{5 \times 10^{- 3}} = 400\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.