angle of variation is zero
magnetic declination is 90o
angle of dip is zero
horizontal component of the Earth's magnetic field is zero
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The correct answer is A: angle of variation is zero.
The Earth's magnetic equator is an imaginary line that runs around the middle of the Earth, parallel to the geographic equator. At points on the magnetic equator, the magnetic field is horizontal, and the angle of variation (also known as magnetic declination) is zero.
Jos, Nigeria is indeed located near the Earth's magnetic equator, which means that:
- The angle of variation is zero, as the magnetic field lines are parallel to the Earth's surface.
- The other options are not correct:
- B: Magnetic declination is the angle between the magnetic north and true north, which is not 90° at Jos.
- C: The angle of dip is the angle between the magnetic field lines and the horizontal plane, which is not zero at Jos (although it's close to zero near the magnetic equator).
- D: The horizontal component of the Earth's magnetic field is not zero at Jos; in fact, it's relatively strong near the magnetic equator.
