Magnetic fields/ force on conductors

AI Thread Summary
To calculate the magnetic field (B) at a distance of 50 cm from a long straight conductor carrying a current of 1000A, the correct approach involves using the appropriate equation that relates B to the current, rather than focusing on force calculations. The discussion highlights the confusion between calculating magnetic force and magnetic field, emphasizing the need for a specific formula from textbooks or online resources. Participants suggest looking for the Biot-Savart law as a potential method to derive B. The initial attempt at a solution mistakenly used force equations, which are not applicable for this calculation. Understanding the correct relationship between current and magnetic field is crucial for solving the problem accurately.
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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