The plane of the coil of tangent galvanometer is kept parallel to magnetic meridian to

Given Data :

Plane of the coil of tangent galvanometer is kept parallel to magnetic meridian

Formula Used :

$\mathrm{B}=\frac{2{\mu }_0\text{ in }}{2\mathrm{r}}$

Detailed Solution :

This is the principle on which tangent galvanometer works
$$\begin{gathered} \mathrm{B}=\frac{2{\mu }_0\text{ in }}{2\mathrm{r}} \\ \mathrm{n}=\text{ no. of turms } \\ \mathrm{i}=\text{ current } \\ \mathrm{r}=\text{ radius of coil } \end{gathered}$$
It is kept perpendicular to horizontal component of earth's magnetic field so that it ran not affect the magnetic field of coil

Hence, the correct option is C