In the given figure, a diode D is connected to an external resistance R = 100 and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be :
40 mA
20 mA
35 mA
30 mA
As we learnt in
P -N junction as diode -
It is a one way device. It offers a low resistance when forward biased and high resistance when reverse biased.
- wherein
R = 0, Forward
R Reverse
The emf developed across diode is 0.5 V.
Total applies potential = 3.5 V
Potential difference across resistance of 100 is 3 V.
Current across 100 resistance
Option 1)
40 mA
This option is incorrect
Option 2)
20 mA
This option is incorrect
Option 3)
35 mA
This option is incorrect
Option 4)
30 mA
This option is correct