Earth magnetism and its application

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Discussion Overview

The discussion revolves around the effects of Earth's magnetic field on satellites and spacecraft, particularly regarding the induction of electric currents. It explores theoretical implications and practical considerations related to magnetism in space.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions why satellites or spacecraft do not become electrified due to Earth's magnetism, suggesting an expectation of induced currents.
  • Another participant clarifies that a magnetic field does not always generate voltage, noting that voltage typically arises from changing magnetic fields or significant potential differences, which are not common in this context.
  • A different viewpoint suggests that the Earth's magnetic field is too weak to induce appreciable current, and that any coils capable of doing so would be impractically large and heavy. This participant also mentions the potential for such currents to draw energy from the satellites' orbits, leading to orbital decay.
  • A later reply provides a reference to the concept of an electrodynamic tether, implying a related area of study.

Areas of Agreement / Disagreement

Participants express differing views on the effects of Earth's magnetic field on satellites, with no consensus reached on the implications or mechanisms involved.

Contextual Notes

The discussion does not address specific assumptions about the strength of the magnetic field or the conditions under which currents might be induced, leaving these aspects unresolved.

Rishav sapahi
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if magnetic field induce current then why satelites or spaceship doesn't gets electrified due to Earth magnetism
 
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A magnetic field doesn't always have a voltage associated with it. Voltage can be generated by a changing magnetic field, or when the potential between two areas are high enough (e.g. lightning). However, this does not normally occur naturally.
 
The field is extremely weak and the coils needed to generate appreciable current would probably be horribly large and heavy. Plus it would create current by stealing orbital energy from the satellites, and they would slowly fall from orbit.
 

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