In the following circuit,the reading in the ammeter is (in $mA$)

Which of the following is correct with respect to the following statements? Due to diffusion of electrons from $n$ to $p$-side:
$I$. electrons are accumulated in the depletion region.
$II$. electron drift current is from $p$-side to $n$-side.
$III$. an ionised donor is left in the $n$-region.
$IV$. electrons of $n$-side come to $p$-side and electron-hole combination takes place in $p$-side.
Select the correct option from the following.

$A$ $p-n$ junction diode is connected to a battery of $emf$ $5.5\, V$ and external resistance $5.1\, k\Omega$. The barrier potential in the diode is $0.4\, V$. The current in the circuit is

When a $P-N$ junction is forward biased,which of the following is true?

In the case of forward biasing of a $PN-$ junction,which one of the following figures correctly depicts the direction of flow of charge carriers?

The potential barrier in the depletion layer is due to