The curve between charge density $\rho$ and distance $r$ near a $p$ - $n$ junction is best represented by
The curve between charge density $\rho$ and distance $r$ near a $p$ - $n$ junction is best represented by
Solution
As we know that, in case of $p-n$ junction diode, there is no or very less movement of charges in the depletion region.
$\therefore$ Current is least in depletion region.
So, graph of charge density versus distance will be as shown below
