If a diode having infinite reverse bias resistance is connected in a circuit as shown in the figure,then $I_1$ and $I_2$ are respectively:

Which of the following represents a reverse-biased diode?

Can we take one slab of $p-$type semiconductor and physically join it to another $n-$type semiconductor to get $p-n$ junction?

The depletion region of a $p-n$ junction:

Refer to the circuit diagram given in the figure. Which of the following observations are correct?
$A.$ Total resistance of the circuit is $6 \ \Omega$.
$B.$ Current in the ammeter is $1 \ A$.
$C.$ Potential across $AB$ is $4 \ V$.
$D.$ Potential across $CD$ is $4 \ V$.
$E.$ Total resistance of the circuit is $8 \ \Omega$.
Choose the correct answer from the options given below:

In the following circuit,$PN$-junction diodes $D_1, D_2$,and $D_3$ are ideal. For the following potentials of $A$ and $B$,the correct increasing order of resistance between $A$ and $B$ will be:
$(i) V_A = -10\,V, V_B = -5\,V$
$(ii) V_A = -4\,V, V_B = -12\,V$