What is the value of the current through the diode in the given circuit (in $\text{ mA}$)?

The circuit contains two diodes,each with a forward resistance of $50\, \Omega$ and an infinite reverse resistance. If the battery voltage is $6\, V$,the current through the $120\, \Omega$ resistance is $mA$.

In the circuit shown,assume the diode to be ideal. When $V_{i}$ increases from $2 \ V$ to $6 \ V$,the change in the current is (in $mA$):

$A$ $P-N$ junction is a ............ .

In a $p-n$ junction,an electric field of $5 \times 10^5 \ V/m$ exists in the depletion region. The minimum kinetic energy of a conduction electron,in order to diffuse from $n$-side to the $p$-side,is found to be $3.2 \times 10^{-20} \ J$. The width of the depletion region is,

In a $p-n$ junction diode,the direction of diffusion current is from