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
Answer & explanation
Correct answer: option 2
B = BH tan θ
= (0.34 x 10–4) (tan 30°)
= (0.34 x 10–4) (0.577)
= 1.96 x 10–5 T