The depletion layer consists of

If no external voltage is applied across a $P-N$ junction,there would be:

$Ge$ and $Si$ diodes start conducting at $0.3\,V$ and $0.7\,V$ respectively. In the following figure,if the $Ge$ diode connection is reversed,the value of $V_0$ changes by: ...... $V$ (assume that the $Ge$ diode has a large breakdown voltage).

Currents flowing in each of the following circuits $A$ and $B$ respectively are

In the figure,the potential difference between $A$ and $B$ is......$V$.

For an ideal diode,the current in the following arrangement is: