$A$ $P-N$ junction has a potential barrier of $0.5 \ V$. If the depletion region is $5 \times 10^{-7} \ m$ wide,what will be the intensity of the electric field in this region?

The circuit shown contains a $12 \, V$ battery,a $4 \, \Omega$ resistor,and two branches in parallel,each containing an ideal diode and a resistor. Branch $1$ has diode $D_1$ and a $3 \, \Omega$ resistor,while branch $2$ has diode $D_2$ and a $2 \, \Omega$ resistor. Determine the current flowing through the circuit. (in $, A$)

The example for non-ohmic resistance is

What are the values of the currents flowing in each of the following diode circuits $X$ and $Y$ respectively? (Assume that the diodes are ideal)

Avalanche breakdown in a $PN$ junction diode is due to

In the given options,the diode that is forward biased is