A moving coil galvanometer has a coil with
175 turns and area 1 cm
2
. It uses a torsion band
of torsion constant 10
–6
N-m/rad. The coil is
placed in a maganetic field B parallel to its
plane. The coil deflects by 1° for a current of
1 mA. The value of B (in Tesla) is
approximately :-