Rankers Physics

P-N Junction Diode and its applications: Practice Problem & Solution

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 : P-N Junction Diode and its applications diagram: Two PN-junctions can be connected in series by
In the circuit (1) and (2)
In the circuit (2) and (3)
In the circuit (1) and (3)
Only in the circuit (1)

Solution Explained:

To solve this problem, we apply the core principles of P-N Junction Diode and its applications. Understanding the underlying formula is key to arriving at the correct answer below:

In circuit 1. First Diode is forward biased and second diode is reverse biased. So, potential across 1st diode is less than 2nd diode.

In circuit 2: Both the diodes are forward biased so potential difference across them is equal

In circuit 3: Both the diodes are reverse biased so potential difference across them is equal to V/2.

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1. Assertion (A): In a N-type semiconductor, the number of holes get reduced. Reason (R): Rate of recombination of holes would increase due to the increase in the number of electrons  
2. In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R) Assertion (A): The photo-diode can be used as a photodetector to detect optical signals. Reason (R): It is easier to observe the change in the current with change in the light intensity, if a forward bias is applied to photodiode.  
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