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

What will be the current flowing in the circuit?

In the given circuits $(a)$,$(b)$,and $(c)$,the potential drop across the two p-n junctions are equal in:

For the given circuit,find $V_{AB} = ......V$.

Which of the following statements is not correct when a junction diode is in forward bias?

$A$ semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z=33)$. $A$ second semiconductor $Y$ is made by doping germanium with indium $(Z=49)$. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct?