When a $p-n$ junction diode is in forward bias,which type of charge carriers flows in the connecting wire?

If the $p-n$ junction diode is unbiased,

Write the formula and definition of dynamic resistance and also state their approximate values for forward bias and reverse bias.

The change in current through a junction diode is $12 \, mA$ when the forward bias voltage is changed by $0.6 \, V$. The dynamic resistance is

In the following circuit,$PN$-junction diodes $D_1, D_2$,and $D_3$ are ideal. For the following potentials of $A$ and $B$,the correct increasing order of resistance between $A$ and $B$ will be:
$(i) V_A = -10\,V, V_B = -5\,V$
$(ii) V_A = -4\,V, V_B = -12\,V$

The $i-V$ characteristic of a $P-N$ junction diode is shown in the figure. The approximate dynamic resistance of the $P-N$ junction when a forward bias of $2 \; V$ is applied is ....... $\Omega$.