Magnetic field at center of wire

AI Thread Summary
The discussion revolves around calculating the magnetic field at the center of a wire with two negative currents. Initially, the contributor considers the magnetic field produced by the original wire, noting it is zero at the center. They analyze the effects of two additional currents and how the current density changes with area. Ultimately, they conclude that the magnetic fields from the currents create a net effect that remains constant due to their specific angles. The contributor expresses satisfaction after resolving the problem.
cupid.callin
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Homework Statement


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The Attempt at a Solution



how i did was that i consider the two negative currents flowing through two drills ... and let current from the original wire is out of plane

so on first drill mag field will be towards left (field by original wire at its center is 0)

as after second drill , current density remains same and area dec ... so current also dec.

now the field due to new line will be perpendicular to line joining its center ... so field at center shall inc ... its not the answer :cry:
 

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Oh ... solved it ... both field will have 120 angle ...

so net will remain same ... :p
 

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