In an unbiased $n-p$ junction,electrons diffuse from $n-$ region to $p-$ region because

$A$ $p-n$ junction diode can withstand up to $20 \, mA$ current under forward bias. The diode has a potential difference of $0.5 \, V$ across it, which is assumed to be independent of current. What is the maximum voltage of the battery used to forward bias the diode when a resistance of $125 \, \Omega$ is connected in series with it (in $V$)?

$A$ $p-n$ junction diode is reverse biased with a voltage of $8 \, V$. If the resistance of the diode is $4 \times 10^7 \, \Omega$, then the reverse saturation current is: (in $ \, \mu A$)

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?

As per the given circuit,the value of current through the battery will be $\dots \; A$.

For the diode,the characteristic curves are given at different temperatures. The relation between the temperatures is