Force Between Parallel Conductors

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Homework Help Overview

The discussion revolves around a physics problem involving the force between parallel conductors, specifically focusing on a floating wire carrying a current and its interaction with another wire below it. The problem includes parameters such as the lengths of the wires, their masses, and the currents they carry.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to apply a formula related to the force per unit length between two parallel conductors and expresses confusion regarding the weight of the floating wire in relation to the forces acting on it.

Discussion Status

Some participants have offered guidance by suggesting the application of Newton's 2nd law to analyze the forces acting on the floating wire. The discussion appears to be progressing with participants sharing their experiences related to similar problems.

Contextual Notes

The original poster mentions specific values for the lengths, mass, and currents involved, indicating a structured approach to the problem. There is an underlying assumption regarding the balance of forces acting on the floating wire that remains to be fully explored.

miniradman
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Hi there, I really need help with one question and help/hints would be greatly appreciated

1. A wire 3meters long, mass 0.10kg and carrying a current of 70.0 Amps floats without support above a horizontal wire 2.0cm below and parrallel to it. Find the current in the lower wire



2. I'm guessing this could be relevant formulas area? this formula

F/L = µo/2(pi) * I1 I2/d

where:
L= 3.00m
I1(subscript 1) = 70.00A
I2(subscript 2) = ?
d= 2cm or 0.02m



3. This is the exact working out that I have attempted

1/3 = (4(pi)*10^-7)/2(pi) * (70.0 I2/0.02)

= (8.79*10^-5)I2/0.125

*I am confused about the weight
 
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Apply Newton's 2nd law to the floating wire. Then you can find F. Then all you have to do is solve for I2.
 
Oh thanks mate, that was a lot of help!

(I feel dumb now):wink:

Cheers!
 
No problem.

I had trouble with those problems once too.
 

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