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Magnetic Field

The earth's f...

Question

The earth's field departs from its dipole shape substantially at large distance (greater than about $3000$ km). The responsible factor for this distortion is then?

A

Motion of ions in earth's ionosphere

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B

Motion of ions in earth's atmosphere

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C

Motion of ions in earth's lithosphere

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D

Motion of ions in the space

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Solution

The correct option is B Motion of ions in earth's ionosphere
Due to motion of ions in earth's ionosphere the earth's magnetic field gets modified.

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(c) The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism. What might be the 'battery' (i.e., the source of energy) to sustain these currents?
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