Grade 7 Magnetic field | BCHydro Power Smart for Schools - Free Printable

Based on the diagram provided, here is the solution to the problem regarding Earth's magnetic field.

Step-by-Step Analysis:

1. Identify the Magnetic Poles:
The diagram labels two types of poles: "Geographic" (where the Earth spins) and "Magnetic" (related to the magnetism).
* Look at the top of the image. The label "North Magnetic Pole" points to the dashed line near the Geographic North Pole.
* Look at the bottom of the image. The label "South Magnetic Pole" points to the dashed line near the Geographic South Pole.

2. Analyze the Magnetic Field Lines (Arrows):
* In physics, magnetic field lines always travel from a North pole to a South pole outside of the magnet.
* Observe the arrows on the curved black lines in the diagram. They are pointing outward from the bottom area and curving around to point inward toward the top area.
* Since the arrows leave the bottom and enter the top, the bottom acts as the magnetic North source, and the top acts as the magnetic South sink.

3. Determine the Polarity:
* Because the field lines emerge from the region labeled "South Magnetic Pole" (at the bottom), this region is actually the North pole of Earth's internal magnet.
* Because the field lines enter the region labeled "North Magnetic Pole" (at the top), this region is actually the South pole of Earth's internal magnet.

4. Conclusion:
This explains why the north-seeking end of a compass needle points North. Opposite poles attract, so the North pole of the compass is attracted to the South pole of the Earth's magnet, which is located near the Geographic North Pole.

Final Answer:
The diagram shows that Earth's North Magnetic Pole (located near the Geographic North Pole) is actually the South pole of Earth's magnetic field, because the magnetic field lines point inward toward it. Conversely, the South Magnetic Pole (located near the Geographic South Pole) is the North pole of Earth's magnetic field, because the field lines point outward from it.