Find the current $i$ in the circuit.

In the case of forward biasing of a $p-n$ junction diode,which one of the following figures correctly depicts the direction of conventional current (indicated by an arrow mark)?

If the internal resistance of the cell is negligible,then the current flowing through the circuit is: (in $A$)

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $A$ diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically.
Reason $R$: Below the critical voltage limit,only majority charge carriers flow which increases drastically above critical voltage.

$A$ thermistor is usually made of......

When a $P-N$ junction is in reverse bias,the current flowing through the junction is primarily due to: