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Q. Earth's magnetic field is

Delhi UMET/DPMTDelhi UMET/DPMT 2008Magnetism and Matter

Solution:

It has been established that earth's magnetic field is fairly uniform. The strength of this field at the surface of earth is approximately $10^{-4}$ tesla or 1 gauss. The field is not confined only to earth's surface. It extends upto a height nearly 5 times the radius of earth.