Question

A potential barrier of $0.4V$ exists across a p-n junction. A constant electric field of magnitude ${10}^{6}V/m$ exists in the depletion region. The width of depletion region is

• A. $4\times {10}^{-7}m$
• B. $0.1mm$
• C. $5\times {10}^{-7}m$
• D. $2mm$

Answer 1

The correct option is A $4\times {10}^{-7}m$

Width of the depletion region,
$d=\frac{V}{E}=\frac{0.4}{{10}^6}=4\times {10}^{-7}m$