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Questions  >>  CBSE XII  >>  Physics  >>  Magnetism and matter
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Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which $|B|$ is minimum

$\begin{array}{1 1} \theta = \large\frac{\pi}{4} \\ \theta= \large\frac{\pi}{2} \\ \theta =0 \\ \theta =\large\frac{\pi}{3} \end{array} $

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