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Magnetic field with a split current

  1. Nov 20, 2012 #1
    1. The problem statement, all variables and given/known data
    A circular conducting ring of radius R is connected to two exterior straight wires at two ends of a diameter. The current I splits into unequal portions while passing through the ring. What is the magnitude of B at the center of the ring?

    3. The attempt at a solution
    My problem isnt with solving the question, it's with which equation to use. i originally did it using the equation finding B in a wire B=μI/2∏R, however that is apparently the incorrect equation. the equation is B=μI/4R, i dont know what the equation is, and considering the problem is of a current carrying wire that splits into 2 wires (where the current is distributed unequally) then reconnects to form a single wire again. i would think you would use the equation to find B in a wire.

    If someone could explain why i am suppose to use the B=μI/4R equation and what it is i would appreciate it so much.
     
  2. jcsd
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