The magnetic needle of a tangent galvanometer is deflected at an angle of 30° due to a magnet. The horizontal component of earth’s magnetic field 0.34 x 10–4 T is along the plane of the coil. The magnetic intensity is

1.96 x 10–4 T                                                              1.96 x 10–5 T 1.96 x 10–3 T    1.96 x 105 T

1.96 x 10–5 T

B = BH tan θ             = (0.34 x 10–4) (tan 30°)             = (0.34 x 10–4) (0.577)             = 1.96 x 10–5 T