Why Does Current Density Point Downwards in a Magnetic Field?

AI Thread Summary
Current density points downwards in a magnetic field due to the interaction between the magnetic field and the flow of charge carriers. The participant expresses confusion about the direction of current density (J=I/A) in an insulating pipe, questioning the physical meaning of the problem. They acknowledge that while conventional current would experience a force in the magnetic field, the concept of current density seems abstract in this context. The discussion highlights the need for clarification on how current flows in an insulating medium. Overall, the problem serves as a conceptual exercise rather than a practical scenario.
loba333
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Homework Statement


Heres the problem:
ZbfMy.jpg


Homework Equations



F=BIL F=qvB

The Attempt at a Solution



I really don't know where to start. Can you guys give me a hand. Maybe a link to a web page explaining. I understand if it were convention current flowing through the 'pipe' it would experience a force due to the magnetic field. I don't understand why current density which I'm assuming just (J=I/A) is pointing downwards ?

Thank you in advance
 
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I think this may be just a "mind exercise" of a problem that in reality has no meaning.
It says the pipe is insulating, so it's really not clear where does this current flows through.
 
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