Question
Draw a neat labelled diagram for angle of dip.
✓
Answer
Write a short note on Earth's magnetic field. Mention the extreme values of magnetic field at magnetic poles and magnetic equator.
$i$. Magnetic force experienced per unit pole strength is magnetic field $\vec{B}$ at that place.
$ii$. This field can be resolved in components along the horizontal $\left(\vec{B}_H\right)$ and along vertical $\left(\vec{B}_v\right)$.
$iii$. The two components are related with the angle of dip $(\varnothing$ as, $B _{ H }= B \cos \varnothing, B _{ v }= B \sin \varnothing)$
$\frac{B_v}{B_H}=\tan \varnothing$
$B ^2= B _v^2+ B _H^2$
$\therefore B =\sqrt{ B _{ V }^2+ B _{ H }^2}$
$iv.$ At the magnetic North pole: $\vec{B}=\vec{B}_{\text {v }}$, directed upward, $\vec{B}_{ H }=0$ and $\varnothing=90^{\circ}$.
$v$. At the magnetic a south pole: $\vec{B}=\vec{B}_{ v },$ directed downward, $\vec{B}_{ H }=0$ and $\varnothing=270^{\circ}$.
$vi.$ Anywhere on the magnetic equator $($magnetic great circle$) : B = B _{ H }$ along South to
North, $\vec{B}_{ V }=$ 0 and $\varnothing=0$
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