Calculate the amount of charge flowing in $2$ minutes in a wire of resistance $10\,\Omega$ when a potential difference of $20\,V$ is applied between its ends.

In the given circuit,the current through $2 \ \Omega$ resistor is

The current $(I)$ drawn from the battery in the given circuit is (in $A$)

The smallest temperature difference that can be measured with a combination of a thermocouple of thermo $e.m.f.$ $30\,\mu V$ per degree and a galvanometer of $50\,\Omega$ resistance,capable of measuring a minimum current of $3 \times 10^{-7} \, A$ is ............... $^\circ C$.

$A$ galvanometer of resistance $G$ is connected in a circuit. Now,a resistance $R$ is connected in series with the galvanometer. To keep the main current in the circuit unchanged,the resistance $S$ to be put in parallel with the series combination of $G$ and $R$ is:

The potential difference between point $A$ and $B$ is ............. $V$.