On increasing the reverse bias to a large value in a $P-N$ junction diode,current

The $I-V$ characteristics of a $p-n$ junction diode in forward bias is shown in the figure. The ratio of dynamic resistance,corresponding to forward bias voltages of $2 \; V$ and $4 \; V$ respectively,is

When a forward bias is applied to a $p-n$ junction,it

In a forward-biased $P-N$ junction diode,how does the potential barrier behave?

In a reverse biased diode, when the applied voltage changes by $1 \, V$, the current is found to change by $0.5 \, \mu A$. The reverse bias resistance of the diode is

The voltage $V_0$ in the network shown is