The depletion layer consists of

Which of the following statements concerning the depletion zone of an unbiased $PN$ junction is (are) true?
$(A)$ The width of the zone is independent of the densities of the dopants (impurities).
$(B)$ The width of the zone is dependent on the densities of the dopants.
$(C)$ The electric field in the zone is produced by the ionized dopant atoms.
$(D)$ The electric field in the zone is provided by the electrons in the conduction band and the holes in the valence band.

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

If the internal resistance of the cell is negligible,then the current flowing through the circuit is: (in $A$)

For an ideal diode,the current in the following arrangement is:

Find the current flowing through the ideal diode in the given circuit. (in $A$)