29. Cross-section of a system of three parallel lines of endless wires with currents I1 = I2 = I and I3 = 2I shown in Fig. 23. The distance between adjacent wires l = 8 cm. On which side and at what distance x from the current I1 on the line aa 'of the magnetic field strength is zero?

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)