Magnetic field due to currentHard
Question
Which of the following demonstrated that earth has a magnetic field :-
Options
A.Intensity of cosmic rays (stream of charged particle coming from outer space) is more at the poles than at the equator
B.Earth is surrounded by an ionsphere (a shell of charged particles)
C.Earth is a planet rotating about the north south axis
D.Large quantity of iron ore is found in the earth
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