Magnetic fields and current flows

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Homework Help Overview

The discussion revolves around a physics problem involving a copper rod in a magnetic field, specifically focusing on the conditions required for the rod to levitate and the direction of current flow.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply the equations of force and magnetic interaction to determine the minimum current needed for levitation. There is uncertainty about the correctness of their calculations.

Discussion Status

Some participants affirm the original poster's calculation, indicating a level of agreement on the approach taken. However, there is also an expression of self-doubt from the original poster regarding their understanding of the concepts involved.

Contextual Notes

The discussion includes an acknowledgment of the effort required to grasp the underlying physics concepts and formulas, reflecting the challenges faced by students in this area.

liz_p88
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Homework Statement



A 2.50 meter long copper rod has a mass of 0.25 kilograms. A magnetic field of 0.15 Teslas is oriented horizontally from south to north. a.) What is the minimum current in the rod that would allow it to "levitate" in this magnetic field? b.) What is the direction of the current in the wire?

Homework Equations



F = mg
F = ILB
ILB = mg

The Attempt at a Solution



I = mg/(LB)

(.25kg)(9.8m/s^2)/(2.5m)(.15T) = 6.533 A, East

I'm not sure if I did this correctly
 
Physics news on Phys.org
yes you are correct.
 
Thank you! I doubt myself so much. I have to work so hard to understand these concepts and formulas
 
yes, work hard and you will gain confidence.
 

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