The resistance of a reverse biased $P-N$ junction diode is about

If a $p-n$ junction is forward biased,then which of the following figures gives the correct direction of current inside the semiconductor?

The current $I$ in the circuit shown below is: (All diodes are ideal and identical)

Write a short note on a semiconductor diode.

Consider a $p-n$ junction as a capacitor, formed with $p$ and $n$-materials acting as thin metal electrodes and depletion layer width acting as separation between them. Basing on this, assume that an $n-p-n$ transistor is working as an amplifier in $CE$ configuration. If $C_1$ and $C_2$ are the base-emitter and collector-emitter junction capacitances, then :

What is the current through an ideal $PN-$ junction diode shown in the figure below? (in $mA$)