Question

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Explanation:

Analyze the physical principles of dip needles

A dip needle measures the vertical inclination of Earth's magnetic field. The red end of the needle points toward the magnetic north pole of the mineral.

Determine normal polarity behavior

During normal polarity, magnetic field lines emerge from the Southern Hemisphere and enter the Earth in the Northern Hemisphere. Therefore, in the Northern Hemisphere:

• The magnetic north pole of a mineral (red end) points downward into the Earth.
• This corresponds to dip needles where the red end is tilted below the horizontal.

Determine reversed polarity behavior

During reversed polarity, magnetic field lines emerge from the Northern Hemisphere and enter the Southern Hemisphere. Therefore, in the Northern Hemisphere:

• The magnetic north pole of a mineral (red end) points upward, out of the Earth.
• This corresponds to dip needles where the red end is tilted above the horizontal.

Classify each dip needle item

Let us examine the six draggable items from left to right:

1. First needle: Red end points steeply upward and to the right. Since it points up, this represents Reversed Polarity.
2. Second needle: Red end points straight up. Since it points up, this represents Reversed Polarity.
3. Third needle: Red end points downward and to the right (the grey end points up). Since the red end points down, this represents Normal Polarity.
4. Fourth needle: Red end points downward and to the right. Since the red end points down, this represents Normal Polarity.
5. Fifth needle: Red end points straight down. Since the red end points down, this represents Normal Polarity.
6. Sixth needle: Red end points upward and to the left. Since the red end points up, this represents Reversed Polarity.

Group the items into bins

• Normal Polarity: Third needle (tilted down-right), Fourth needle (tilted down-right), Fifth needle (pointing straight down).
• Reversed Polarity: First needle (tilted up-right), Second needle (pointing straight up), Sixth needle (tilted up-left).

Answer:

Based on the orientation of the red end of each dip needle in the Northern Hemisphere:

• Normal Polarity (red end points downward into the Earth):
• The third needle (tilted downward to the right)
• The fourth needle (tilted downward to the right)
• The fifth needle (pointing straight down)

• Reversed Polarity (red end points upward out of the Earth):
• The first needle (tilted upward to the right)
• The second needle (pointing straight up)
• The sixth needle (tilted upward to the left)