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Moving Charges And Magnetism

Question
CBSEENPH12037609

What is the approximate distance upto which earth's magnetic field extends?

Solution
The magnetic field of earth extends to nearly five times the radius of the earth.
i.e., 5 x (6.4 x 10
3) km = 3.2 x 104 km. 

where, radius of the earth, r= 6.4 x 103