Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 

A moving coil galvanometer is designed to use the concave shaped magnetic poles which render the field to be radial between them so that the plane of the coil is always perpendicular to the lines of induction even after deflection.

Torque on a current carrying coil is given as, 

$\overrightarrow{\mathrm{\tau }}=\overrightarrow{\mathrm{M}}\times \overrightarrow{\mathrm{B}}$

For a radial magnetic field, magnetic moment and magnetic field are perpendicular to each other.

Hence, $\mathrm{\tau }=\mathrm{MB}$ , which is maximum.
So, the torque on the coil is maximum in any position of the coil.