Question

In earthmagnetic field b if the frequency of magnetic needle is n then

Answer 1

As we have done in the last problem,

BH tan Φ = 0.36 × 10–4 tan 60o

=  0.36 × 10–4 √3 = 0.62 × 10–4 Wb / m2

Hence, (D) is the correct option.