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(A) The earth's magnetic field $B$ can be resolved into two components: the horizontal component $H$ and the vertical component $V$.At the magnetic po

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$Zero, 90^{\circ}$

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(A) The earth's magnetic field $B$ can be resolved into two components: the horizontal component $H$ and the vertical component $V$.At the magnetic poles, the magnetic field lines are perpendicular to the earth's surface.Therefore, the angle of dip $\delta$ is $90^{\circ}$.The horizontal component is given by $H = B \cos(\delta)$.Substituting $\delta = 90^{\circ}$, we get $H = B \cos(90^{\circ}) = B 	imes 0 = 0$.Thus, at the magnetic north pole, the horizontal component is $0$ and the angle of dip is $90^{\circ}$.

At the magnetic north pole of the earth, the value of the horizontal component of the earth's magnetic field and the angle of dip are, respectively:

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