When forward bias is applied to a $p-n$ junction,then what happens to the potential barrier $(V_B)$ and the width $(X)$ of the depletion region?

The cause of the potential barrier in a $p-n$ junction diode is

Find the current through the $1\,\Omega$ resistance in the given circuit.

For the circuit shown in the figure,$V_{AB} = $ ....... $V$.

Different voltages are applied across a $P-N$ junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current?

$A$ $P-N$ junction diode is in forward bias with a current of $10 \ mA$. The potential drop across the diode is $0.5 \ V$. Assuming the current is independent of the potential,what is the maximum voltage of the battery in series with a $200 \ \Omega$ resistor to maintain this forward bias condition? (in $V$)