Which statement about Earth's magnetic field is correct?

Which statement about Earth's magnetic field is correct?

• A. Field lines enter Earth near the South Pole.
• B. Field lines enter Earth near the North Pole.
• C. Field lines exit Earth near the North Pole.
• D. Field lines form closed loops around the equator.

Answer: (B)

The main idea is how magnetic field lines indicate direction. For a dipole like Earth, lines outside the planet run from the magnetic north region toward the magnetic south region. The Earth’s magnetic south pole lies near the geographic North Pole, so the field lines enter the Earth near the North Pole and then curve out toward the South Pole. This aligns with how a compass behaves: its north-seeking end points toward the Earth's magnetic north region. So field lines entering near the North Pole is the correct description. The other statements don’t fit because they would place entry at the South Pole, claim exit at the North Pole, or describe a loop wrapping around the equator, which doesn’t reflect the two-pole connection of Earth’s dipole field.

The main idea is how magnetic field lines indicate direction. For a dipole like Earth, lines outside the planet run from the magnetic north region toward the magnetic south region. The Earth’s magnetic south pole lies near the geographic North Pole, so the field lines enter the Earth near the North Pole and then curve out toward the South Pole. This aligns with how a compass behaves: its north-seeking end points toward the Earth's magnetic north region. So field lines entering near the North Pole is the correct description. The other statements don’t fit because they would place entry at the South Pole, claim exit at the North Pole, or describe a loop wrapping around the equator, which doesn’t reflect the two-pole connection of Earth’s dipole field.