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in Magnetic effects of current and magnetism by (50 points)
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Which of the following demonstrated that earth has a magnetic field:-

(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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(A) intensity of cosmic rays (Stream of charged particle coming from outer space) is more at the poles than at the equator.

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