Question

In the middle of the depletion region of reversed biased p-n junction the

• A. electric field is zero
• B. potential is infinite
• C. electric field is maximum
• D. potential is zero

Hint:

The field in the depletion region rises from zero at its edges to a maximum at the junction, which is the middle of the region.

Answer 1

The Correct Option is C

Step 1: Think of the charge layers
Equal and opposite space charges sit on either side of the junction, so field lines run from the n-side to the p-side.

Step 2: Where the field is largest
The field adds up across the charge layers and reaches its largest value at the junction, which is mid-way.

Step 3: Eliminate the rest
The field is not zero there, and the potential is neither infinite nor zero, so (C) fits.

Final Answer:
The field peaks at the junction in the middle of the depletion layer. \[ \boxed{\text{(C) }\text{electric field is maximum}} \]