Magnetic fields/ force on conductors

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Homework Help Overview

The discussion revolves around calculating the magnetic field (B) at a specified distance from a long straight conductor carrying a current. The subject area is electromagnetism, specifically focusing on magnetic fields generated by current-carrying wires.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need to differentiate between calculating the magnetic field and the force due to the magnetic field. There is an emphasis on identifying the correct equation to relate the magnetic field to the current.

Discussion Status

Some participants have pointed out the necessity of using the appropriate equation for calculating the magnetic field, suggesting that the original poster may be using the wrong approach. Guidance has been offered to look for relevant equations in textbooks or online resources.

Contextual Notes

There is mention of multiple unknowns in the original poster's calculations, which may be contributing to their difficulty in finding a solution. The discussion also highlights the importance of understanding the distinction between magnetic field and force.

alice emily
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Homework Statement


calculate a value for B at a distance of 50cm, in ,air, from a long straight cable carrying a current of 1000A.


Homework Equations


F=Bqv=BIl
I=q\t = qv/l
F=LIB


The Attempt at a Solution


i have not been able to calculate an answer as there are constantly two unknowns and i am unable o fine F.
 
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i believe the answer is 4 x 10 to the -4 telsa
 
You're being asked to find magnetic field and not force due to the magnetic field, right?

The equations you wrote allow you to find the force due to a magnetic field, once you already know what B is. However, right now you're trying to find B due to the current. You need a different equation, that's hopefully in your book that relates B and current I.
 
yeah johnj7 is right. You need the proper equation. Look in your textbook for an equation relating B to a current carrying wire. Check online as well. If you're desperate and have learned what is known as the Biot-Savart law, you can derive B from there.
 

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