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(A) The magnetic meridian is the vertical plane passing through the magnetic North and South poles of the Earth. The Earth's magnetic field vector $\v

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Vertical

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(A) The magnetic meridian is the vertical plane passing through the magnetic North and South poles of the Earth. The Earth's magnetic field vector $\vec{B}$ lies entirely within this plane.When a dip needle is placed in a plane perpendicular to the magnetic meridian,the horizontal component of the Earth's magnetic field $(B_H)$ is perpendicular to this plane. Therefore,the effective horizontal component of the magnetic field acting on the needle in this plane is zero.Only the vertical component of the Earth's magnetic field $(B_V)$ acts on the needle in this plane. Since the magnetic force on the needle is directed along the vertical component,the needle will align itself vertically.Thus,the dip needle will remain vertical.

$A$ dip needle in a plane perpendicular to the magnetic meridian will remain:

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