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B-field wires

  • #1
Two parallel wires repel each other with a force per length of 1.00*10^-3 N/m when spaced a distance of 2.50 cm apart. If one wire has a current of 100A, what is the current in the other wire?

Don't know where to start this one.
 

Answers and Replies

  • #2
977
1
Two equations. First, the magnetic field that a wire with current creates at a distance of [tex]r[/tex] from it is:
[tex]B = \frac{\mu _0I}{2\pi r}[/tex]
Second, the magnetic force that operates on a wire with current inside a magnetic field is: (When the magnetic field is perpendicular to the direction of the current)
[tex]F_m = IBl[/tex]
To find the force per length, just divide it by [tex]l[/tex].

Now can you solve it? :smile:
 

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