Question
Draw neat labelled diagram representing the Earth as a magnet.
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Answer
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At a given place on the Earth, a bar magnet of magnetic moment $\vec{m}$ is kept horizontal in the EastWest direction. $P$ and $Q$ are the two neutral points due to magnetic field of this magnet and $\vec{B}_{ H }$ is the horizontal component of the Earth's magnetic field.
$i$. Calculate the angles between position vectors of $P$ and $Q$ with the direction of $\vec{m}$.
$ii$. Points $P$ and $Q$ are $1 m$ from the centre of the bar magnet and $B_H=3.5 \times 10^{-5} T$. Calculate magnetic dipole moment of the bar magnet.
Neutral point is that point where the resultant magnetic field is zero.
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$ii$. Points $P$ and $Q$ are $1 m$ from the centre of the bar magnet and $B_H=3.5 \times 10^{-5} T$. Calculate magnetic dipole moment of the bar magnet.
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