Consider two identical galvanometers and two identical resistors with resistance $R$. If the internal resistance of the galvanometers is $R_G < R/2$,which of the following configurations yield the maximum voltage range and maximum current range?

$A$ moving coil galvanometer,having a resistance $G$,produces full scale deflection when a current $I_g$ flows through it. This galvanometer can be converted into $(i)$ an ammeter of range $0$ to $I_0$ $(I_0 > I_g)$ by connecting a shunt resistance $R_A$ to it and $(ii)$ into a voltmeter of range $0$ to $V$ $(V = GI_0)$ by connecting a series resistance $R_V$ to it. Then,

In a moving coil galvanometer,a strong horse-shoe magnet with concave-shaped pole pieces is used to:

$A$ galvanometer acting as a voltmeter should have . . . . . . .

To find the resistance of a galvanometer by the half-deflection method, the following circuit is used with resistances $R_1 = 9970 \,\Omega$, $R_2 = 30 \,\Omega$, and $R_3 = 0 \,\Omega$. The deflection in the galvanometer is $d$. With $R_3 = 107 \,\Omega$, the deflection changes to $\frac{d}{2}$. The galvanometer resistance is approximately ............... $\Omega$.

$A$ galvanometer has resistance $G \ \Omega$ and $I_g$ is the current flowing through it which produces full-scale deflection. $S_1$ is the value of the shunt which converts it into an ammeter of range $0$ to $3I$,and $S_2$ is the shunt value which converts it into an ammeter of range $0$ to $4I$. The ratio $S_2:S_1$ is: