$PN-$junction diode works as an insulator if connected:

In a semiconductor $p-n$ diode, the doping concentrations on $p$-side and $n$-side are $10^{15} \text{ atoms/cm}^3$ and $10^{18} \text{ atoms/cm}^3$, respectively. Which one of the following statements is true?

The $n$-side of the depletion layer of a $p-n$ junction

Consider the following circuit. The waveform given in input is as shown. If ${V_{B_1}}$ and ${V_{B_2}}$ are less than the peak value of the input,then the output will look like:

Which of the following circuits is reverse-biased?

The current in the circuit will be: