The earth's field departs from its dipol...

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

motion of ions in earth's ionosphere

motion of ions in earth's atmosphere

motion of ions in earth's lithosphere

motion of ions in the space.

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The correct Answer is:

Due to motion of ions in earth's ionosphere the earth's magnetic field gets modified.

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Answer the following questions: (a) The earth's magnetic field varies from point to point in space. Does is also change with time? If so, on what time scale does it change appreciably? (b) The earth's core is known to contain iron. Yet geologists do not regard this as a source of earth's magnetism, why? (c) The charged currents in the outer conducting regions of earth's core are thought to be possible for earth's magnetism. What might be the battery to sustain these currents? (d) The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologist know about the earth's field in such distant past? (e) The earth's field departs from its dipole shape substantially at large distances (greater than about 30000km). What agencies may be responsible for this distortion? (f) Interstellar space has an extremely weak magnetic field of the order of 10^(-12)T . Can such a weak field be of any significant consequence? Explain.

A: The earth's field departs from its dipole shape substantially at large distances (greater than about 30,000 km). R: At large distances, the field gets modified due to the field of ions in motion in the ionosphere which is sensitive to extra-terrestrial distubances such as, the solar wind.

Television signal on earth cannot be recevied at distances greater than 100 km from the transmission station. The reasion behind this is that

The electric field of an electric dipole at a point on its axis , at a distance d from the center of the dipole, varies as

A point charge placed at any point on the axis of an electric dipole at some large distance experiences a force F. What will be the force acting on the point charge when its distance from the dipole is doubled.

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