Topic: Electronic Devices
A PN junction in series with a 100 ohm resistor is forward biased so that a current of 100 mA flows. If voltage across the combination is instantaneously reversed to 10 V at time $t=0$, the reverse current that flows through the junction at $t=0$ is approximately given by
- A. 0 mA
- B. 200 mA
- C. 50 mA
- D. 100 mA
Answer: D. 100 mA
Explanation: At $t=0$, still that diode in forward biased but polarity of voltage source is changed, so that current is same in magnitude because of stored charge but in reverse direction. Hence at $t=0$ Reverse recovery current = 100 mA.