When a reverse bias is applied to a p-n junction, it . . . . . . .

$A$ $P-N$ junction is a ............ .

In an unbiased $P-N$ junction,holes diffuse from the $p-$ region to $n-$ region because

For diode $D_1$,the forward bias resistance is $20 \ \Omega$ and the reverse bias resistance is $600 \ \Omega$. For diode $D_2$,the forward bias resistance is $30 \ \Omega$ and the reverse bias resistance is $200 \ \Omega$. Find the equivalent resistance between $A$ and $B$ if $(i)$ $A$ is at a higher potential,and $(ii)$ $B$ is at a higher potential.

The circuit shown below contains two ideal diodes,each with a forward resistance of $50\,\Omega $. If the battery voltage is $6\,V$,the current through the $100\,\Omega $ resistance (in Amperes) is

Assuming the diodes to be of silicon with forward resistance zero, the current $I$ in the following circuit is.......$mA$