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The electric field profile in the depletion region of a p-n junction in equilibrium is shown in the figure. Which one of the following statements is NOT TRUE?

1. The left side of the junction is n-type and the right side is p-type
2.  Both the n-type and p-type depletion regions are uniformly doped
3. The potential difference across the depletion region is $700\: mV$
4.  If the p-type region has a doping concentration of $10^{15}\: cm^{-3},$ then the doping concentration in the n-type region will be $10^{16}\: cm^{-3}$

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