Question:
Assume the dipole model for earth’s magnetic field B which is given by Bv = vertical component of magnetic field = μ0/4π 2m cos θ/r3, BH = horizontal
component of magnetic field = μ0/4π 2m sin θm/r3, θ = 90o latitude as measured from magnetic equator. Find loci of points for which
(i) |B| is minimum
(ii) dip angle is zero, and
(iii) dip angle is ±45o.
Solution:
(a) |B| is minimum at the magnetic equator.
(b) Angle of dip is zero when θ = π/2
(c) When dip angle is ±45o θ = tan-1 is the locus.
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