After magnetizing the needle and placing it on a cork floating in water, what direction will the needle most likely point?

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Multiple Choice

After magnetizing the needle and placing it on a cork floating in water, what direction will the needle most likely point?

Explanation:
A magnetized needle on a freely rotating support aligns with Earth's magnetic field. When the needle sits on a cork floating in water, it can turn without much friction, so the magnetic torque tries to place the needle so its magnetic moment lines up with the horizontal component of the Earth's field. That horizontal component generally points toward geographic north in most places, so the needle settles in a north–south orientation. It won’t point upward because gravity and buoyancy keep it in the plane of the water, and it won’t point toward the observer since the magnetic field at the location doesn’t point in that direction.

A magnetized needle on a freely rotating support aligns with Earth's magnetic field. When the needle sits on a cork floating in water, it can turn without much friction, so the magnetic torque tries to place the needle so its magnetic moment lines up with the horizontal component of the Earth's field. That horizontal component generally points toward geographic north in most places, so the needle settles in a north–south orientation. It won’t point upward because gravity and buoyancy keep it in the plane of the water, and it won’t point toward the observer since the magnetic field at the location doesn’t point in that direction.

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