Two identical $p-n$ junctions are connected in series with a battery in three ways,as shown below. The potential drops across the two $p-n$ junctions are equal in:

In the circuit given below,the value of the current is

Explain the barrier potential and depletion region in a $p-n$ junction diode.

Find the value of $V_{AB}$ in the given circuit.

When a forward bias is applied to a $p-n$ junction,it $\qquad$ .

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 :