Question

A potential barrier of $0.5V$ exists across a p-n junction. If the width of depletion layer is ${10}^{-6}m$, then intensity of electric field in this region will be

• A. $1\times {10}^{6}V/m$
• B. $5\times {10}^{5}V/m$
• C. $4\times {10}^{4}V/m$
• D. $2\times {10}^{6}V/m$

Answer 1

Answer: (B)

$5\times {10}^{5}V/m$

Intensity of electric field is, $E=\frac{V}{d}=\frac{0.5}{{10}^{-6}}=5\times {10}^{5}V/m$