A moving coil galvanometer has a coil with 175 turns and area 1 cm2 . It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a magnetic 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 :
(1) 10–3 (2) 10–1 (3) 10–4 (4) 10–2
