The figure below show a measured pattern of magnetic field i

The figure below show a measured pattern of magnetic field in space. How much current I passes through the shaded area? (Assume B_1 = 5.00 times 10^-5 T and B_2 = 7.70 times 10^-4 T.)

Solution

the magnetic field is expressed as follows:

    2B₂L₂cos35 = u₀I

   2[7.7X10^-4][0.6] = [4*pi*10^-7]*I

current is, I = 735.66 A