Wire has been tightly coiled on top of a sphere in such a way that coils are rig

Question

Wire has been tightly coiled on top of a sphere in such a way that coils are right next to each other and are all parallel to each other (imagine the parallels, or lines of latitude, on the globe). This results in N coils. Current I runs through the wire. What will be the magnetic field in the center of the sphere? Note: The direction of the magnetic field will depend on the orientation of coils and the current direction, so choose the coil's planes to be perpendicular to the z-axis and the current to be clockwise when looking along the z-axis.

Explanation / Answer

Current is in opposite side so it will create equal magnetic field but in opposite side so total magnetic field will be zero.

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