Question

When the voltage drop across a p – n junction dodeis increased from $0.65$ V to $0.70V,$ the change in the diode current is 5 mA. The dynamic resistance of the diode is.

• A. $20\Omega$
• B. $50\Omega$
• C. $10\Omega$
• D. $80\Omega$

Answer 1

Answer: (C)

$10\Omega$

Answer 2

: Dynamic resistance, $r_{d} = \frac{\Delta V}{\Delta I}$

$r_{d} = \frac{0.7V - 0.65V}{5 \times 10^{- 3}A} = \frac{0.05 \times 1000}{5}\Omega = 10\Omega$