Question

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

• A. $1.0\times {10}^{9}V/m$
• B. $2.0\times {10}^{5}V/m$
• C. $1.0\times {10}^{6}V/m$
• D. $2.0\times {10}^{6}V/m$

Answer 1

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

$\overrightarrow{V}=\overrightarrow{E}\cdot \overrightarrow{r}|V|=|E||r|⟹0.5=E\times 5\times {10}^{-7}\therefore E=1.0\times {10}^{6}V/m$