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- Tell me? Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
- Option 1)
In the circuit (1) and (2)
- Option 2)
In the circuit (2) and (3)
- Option 3)
In the circuit (1) and (3)
- Option 4)
Only in the circuit (1)
Answers (1)
As 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
In figure 2, both PN junction are forward biased and hence both will offer equal resistance and hence potential difference across the two are equal.
In figure 3, both the PN junction are reverse biased hence both will offer equal resistance and potential difference across both is same.
In figure 1, one is forward biased and other is reverse biased.
Option 1)
In the circuit (1) and (2)
This option is incorrect
Option 2)
In the circuit (2) and (3)
This option is correct
Option 3)
In the circuit (1) and (3)
This option is incorrect
Option 4)
Only in the circuit (1)
This option is incorrect
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