$A$ galvanometer of resistance '$G$' is shunted by a resistance of '$S$' ohm. To keep the main current in the circuit unchanged,the resistance to be put in series with the galvanometer is:

Two moving coil galvanometers,$X$ and $Y$,have coils with resistances $10 \Omega$ and $14 \Omega$,cross-sectional areas $4.8 \times 10^{-3} \ m^2$ and $2.4 \times 10^{-3} \ m^2$,and number of turns $30$ and $45$ respectively. They are placed in magnetic fields of $0.25 \ T$ and $0.50 \ T$ respectively. Find the ratio of their current sensitivities and the ratio of their voltage sensitivities.

$A$ galvanometer coil of resistance $50 \,\Omega$ shows full-scale deflection for a current of $100 \,\mu A$. The shunt resistance to be added to the galvanometer to convert it into an ammeter of range $10 \, mA$ is:

The current passing through the galvanometer is $4\%$ of the total current in the circuit. If the resistance of the galvanometer is $G$, the shunt resistance $S$ connected across the galvanometer is:

Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.
$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.
$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.

The deflection in a moving coil galvanometer is