The $\text{I-V}$ characteristic of a $\text{P-N}$ junction in forward bias is shown. The approximate forward resistance of the junction is $-$ (in $Omega$)

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

Two statements are given below:
$A$. When the forward bias voltage across a $p-n$ junction diode increases above a certain threshold voltage,the diode current increases significantly.
$B$. This current is called reverse saturation current.
Choose the correct answer from the options given below:

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

When a diode is forward biased,it has a voltage drop of $0.5\, V$. The safe limit of current through the diode is $10\, mA$. If a battery of emf $1.5\, V$ is used in the circuit,the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is $.....\, \Omega$.

In the following diode circuits,which diode is in a forward-biased condition?