In a reverse-biased $pn$-junction diode,the depletion layer width:

If each diode has a forward bias resistance of $25\,\Omega$ in the circuit shown below,which of the following options is correct?

The ratio of forward bias resistance to reverse bias resistance of a $P-N$ junction is approximately .......

All the diodes are ideal. The current flowing in the $2\,\Omega$ resistor connected between the diodes $D_1$ and $D_2$ is: (in $,A$)

Two ammeters $A_1$ and $A_2$ are connected as shown in the given figure. By neglecting the internal resistance of the ammeters, the reading in the meter $A_1$ is (in $\text{A}$)

In the following circuit,the reading in the ammeter is (in $mA$)