$A$ $2 \ V$ cell is connected across points $A$ and $B$ as shown in the figure. Assume that the resistance of each diode is zero in forward bias and infinity in reverse bias. The current supplied by the cell is (in $A$)

Write a short note on a semiconductor diode.

Identify the solar cell characteristics from the following options.

Show the direction of the electric field that arises in a $p-n$ junction.

In a semiconductor diode,the reverse biased current is due to the drift of free electrons and holes caused by:

Current $I$ through a given $p-n$ junction when a voltage $V$ is applied across it is given by $I = I_0 \left( e^{\frac{V}{2 V_T}} - 1 \right)$, where $I_0$ and $V_T$ are constants. If $r_d(I)$ is the dynamic resistance of the junction, then $r_d(1000 I_0) = \alpha r_d(10 I_0)$, where $\alpha$ is approximately equal to