Ncert Exercises & Solutions

Assume the dipole model for the earth's magnetic field B which is given by,

$B_{v}$ = vertical component of the magnetic field $= \frac{μ_{0}}{4 π} \frac{2 m \cos θ}{r^{3}}$
$B_{H}$ = horizontal component of the magnetic field $= \frac{μ_{0}}{4 π} \frac{msin θ}{r^{3}}$
$θ = 90 °$ = lattitude as measured from the magnetic equator.

Find loci of points for which
(a) |B| is minimum
(b) dip angle is zero and
(c) dip angle is 45°