Force on a conductor in a magnetic field

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Homework Help Overview

The problem involves understanding the behavior of a conductor in a magnetic field, specifically regarding the force acting on a tube filled with seawater when a current is passed through it. The context includes the flow of ions in a solution and the application of a magnetic field.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss whether the equation F = BIL applies to both electron flow and ion flow, with some expressing uncertainty about the nature of current in ionic solutions.

Discussion Status

There is an ongoing exploration of the validity of applying the equation to ionic currents, with some participants providing affirmations while others seek clarification and proof. The discussion reflects differing interpretations of how current behaves in ionic solutions.

Contextual Notes

Participants question the assumptions regarding the flow of ions and the implications for the force experienced by the conductor. There is a focus on the distinction between electron flow and ion flow, as well as the implications of having both cations and anions moving in opposite directions.

BlackWyvern
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Homework Statement


Bill knows that a solution with an ionic salt dissolved in itwill allow a current to flow. Bill finds this quite interesting, so he finds a piece of plastic tubing and hangs it from an apparatus. He pours seawater into the tube until it is full. He then moves a magnet around the tube. Bill then uses a cell to create a current in the solution. Will a force act on the tube? Explain your answer.


Homework Equations


F = BIL


The Attempt at a Solution


I have no idea. I'm not sure if F = BIL only applies to electron flow, or ion flow as well.
 
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BlackWyvern said:
I have no idea. I'm not sure if F = BIL only applies to electron flow, or ion flow as well.
Nope, F=BiL works for all currents :smile:
 
You sure, got some proof? It is a bit far-fetched to just take someone's word for it. Because as far as I know, in electron flow, only electrons move. Whereas, in ion flow, cations and anions both flow in different directions.
 
BlackWyvern said:
You sure, got some proof? It is a bit far-fetched to just take someone's word for it. Because as far as I know, in electron flow, only electrons move. Whereas, in ion flow, cations and anions both flow in different directions.
Indeed cations and anions flow in the opposite directions; however, the question states that there is a current flowing, this means there must be more cations flowing than anions [or vice versa]. Since we have a current, we have a force...
 

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