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Homework Help: Magnetism w/o calculua

  1. Oct 19, 2013 #1
    1. The problem statement, all variables and given/known data
    In the ATTACHMENT is the given circuit. Which contains two resistance
    R1 and R2 in form of circle of radius r = 1 m with a battery
    having e.m.f. V = 10∏ volt. Upper resistance is having
    resistivity = 4Ω-m & lower resistance having resistivity =
    2Ω-m. Angle between two points A and B is 60°. (wires have
    same cross section A1 = A2 = 2 cm2)
    Find magnitude of magnetic field at centre.

    The attempt at a solution
    I tried it using the formula B = μiθ/4∏r. BUT THE ANSWER IS NOT COMING CORRECT.

    Screenshot from 2013-10-19 08:20:55.png
  2. jcsd
  3. Oct 19, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Please don't write in caps.
    What did you get for the currents in both parts of the circle?
    Which field strength did you get, and do you know the correct answer?
    Note that the currents will be different in the two sides. And you have to take their length into account.
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