Question

A potential barrier of $0.50\text{V}$ exists across a P-N junction. If the depletion region is $5.0\times {10}^{-7}\text{m}$ wide, the intensity of the electric field in this region is

• A. $1.0\times {10}^6\text{V/m}$
• B. $1.0\times {10}^5\text{V/m}$
• C. $2.0\times {10}^5\text{V/m}$
• D. $2.0\times {10}^6\text{V/m}$

Answer 1

The correct option is A $1.0\times {10}^6\text{V/m}$

Electric field in a region is $E=\frac{V}{d}=\frac{0.5}{5\times {10}^{-7}}={10}^6\text{V/m}$
$E=1\times {10}^6\text{V/m}$