Three identical p-n junction diodes D1, D2 and D3 are connected across a battery as shown in the figure. If the width of the depletion regions of D1, D2 and D3 are W1, W2 and W3, respectively, the correct option is: 
W2 > W1 = W3
To solve this problem, we need to understand how the width of the depletion region in p-n junction diodes is affected in a given circuit. The diodes D1, D2, and D3 are connected across a battery and the width of the depletion regions, W1, W2, and W3, respectively, is influenced by the direction of current flow through each diode.
Explanation:
- The depletion region width is inversely proportional to the forward current. When a diode is forward-biased, it conducts current, and the depletion region becomes narrower.
- When a diode is reverse-biased, the depletion region widens because no current flows through the diode.
- In the circuit provided, D2 is reverse-biased, while both D1 and D3 are forward-biased. Therefore, W2 is larger than both W1 and W3.
Reasoning:
- W2 is widest because the diode D2 is reverse-biased, hence the depletion region expands.
- W1 = W3 because both diodes are forward-biased, resulting in similar depletion region widths.
Hence, the correct answer is: W2 > W1 = W3
This analysis confirms that the provided correct option aligns with the behavior of p-n junction diodes in the given circuit configuration.
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