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  1. 21.1: Magnetism and Magnetic Fields - Physics LibreTexts

  2. Magnetic Field: Definition, Equation, and Images - Science Facts

  3. Magnetic field - Wikipedia

  4. 11.3: Magnetic Fields and Lines - Physics LibreTexts

  5. Earth’s Magnetosphere: Protecting Our Planet from Harmful Space …

  6. Earth's magnetic field - Wikipedia

  7. Earth's magnetic field: Explained | Space

  8. 11.9: Magnetic Forces and Fields (Summary) - Physics LibreTexts

  9. Magnetic field | Definition & Facts | Britannica