Magnetic field and airplane scenario.

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Discussion Overview

The discussion revolves around the effects of the Earth's magnetic field on an airplane flying horizontally. Participants explore the implications of the magnetic field's orientation and the resulting potential differences across the airplane's wings, examining the behavior of charges in a conducting material under these conditions.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant asserts that the east-side wing of the airplane would be at a lower potential than the west-side wing due to the perpendicular orientation of the Earth's magnetic field.
  • Another participant confirms that this phenomenon occurs in airplanes and provides a rough estimate of a potential difference of about 0.1V.
  • A question is raised regarding the significance of which side of the plane tips toward the Earth, leading to some confusion about the scenario.
  • A participant expresses uncertainty about the reasoning behind the east side being at a lower potential compared to the west side.
  • One participant suggests using the right-hand rule (or left-hand rule) to determine the direction of charge movement and the resulting potential differences.
  • Another participant seeks clarification on the relationship between charge movement and the magnetic field, questioning the direction of positive charge flow in relation to the magnetic field's orientation.

Areas of Agreement / Disagreement

Participants generally agree on the existence of a potential difference between the wings of the airplane due to the magnetic field, but there is some confusion and disagreement regarding the specifics of which wing experiences lower potential and the implications of the airplane's orientation.

Contextual Notes

Some participants express confusion about the scenario, indicating a need for clearer definitions or assumptions regarding the airplane's orientation and the magnetic field's direction.

Quelsita
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An airplane is flying horizontal and heading south in a region where the Earth's magnetic field is directd vertically. The planes wings and body are made of a continuous conducting metal. For these conditions, the tip of the east-side wing would be at a lower potential than the west-side wing.

I just want to check if my reasoning is correct.
OK, so this is true because since the magnetic field is pointing perpendicular to the plane, the charges would migrate to one side?
 
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Correct, and this actually does happen on airplanes. Ballpark calculations I did say there's about .1V potential difference on a typical airplane!
 
Sweet thanks!
Another quick question, does the side of the plane that tips toward the Earth matter?(e.g the west side vs. the east side?).
 
I'm not sure what you mean and why all of a sudden the plane is tipping towards the Earth.
 
Wow. Sorry I confused myself by looking at the wrong problem.
I meant to say that in the question it says that the east side would be at a lower potential. Why is the east side the side that experiences lower potential and not the west side?
 
Well do a right hand rule (or left hand in this case) and find that negative charges are going to move in one direction, which is why you get a specific wing at higher/lower potential.
 
I think I'm still a little confused whith the llink between charge and magnetic field. So in this case, the mag. field of the Earth is pointing directly upward perpandicular to the plane. So, the current is pointing toward the right which means that the positive charge is flowing in the right-direction(or to the east)?
 

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