A) increases the number of donors on the n-side
B) increases the electric field in the depletion zone
C) increases the potential difference across the depletion zone
D) widens the depletion zone
Correct Answer: A
Solution :
When p-side of junction diode is connected to positive of battery and n-side to the negative, then junction diode is forward biased.
In this condition, more number of electrons enter in n-side from battery thereby increasing the number of donor on n-side. Note: The curves for charge density, electric field and potential barrier for a p-n junction are as shown in figure below: 
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