Categories
Physics

The Earth’s Magnetic Field

n a magnetic needle or a bar magnet is freely suspended, it comes to rest roughly in the N-S

poles of the earth. This shows that the earth acts like a magnet, hence, the earth must have N-S  Poles near the geographical poles.

The angle between the magnetic North and the geographical North directions at a place is called “the angle of Declination or Variation”

File:Earths Magnetic Field Confusion.svg

The earth’s magnetic field

The Angle of Dip

This is the angle between the horizontal and the resultant earth’s magnetic field. It can also defined as the angle between the total intensity of the earth’s magnetic field and the horizontal.

angle=dip

However, the angle of dip, declination and the earth’s horizontal field strength are called magnetic  element.

EVALUATION (POST YOUR ANSWERS USING THE QUESTION BOX BELOW FOR EVALUATION AND DISCUSSION):

  1. Distinguish between angle of dip and angle of declination.
  2. Enumerate the magnetic elements.

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