$A$ $P-N$ junction has a potential barrier of $0.5 \ V$. If the depletion region is $5 \times 10^{-7} \ m$ wide,what will be the intensity of the electric field in this region?
- A$10^3 \ V/m$
- B$10^2 \ V/m$
- C$10^6 \ V/m$
- D$10^8 \ V/m$
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