The symmetry is such that all the terms in this element are constant except the distance element dL, which when integrated just gives the circumference of the circle. Big coils count, among its problems, the need of high voltages to drive appreciable currents, and its high. The application of the Biot-Savart law on the centerline of a current loop involves integrating the z-component. One of the main problems we find when performing magnetic measurements is the low efficiency of field producing systems 1, 2, for example, to obtain homogeneous magnetic fields in reduced spaces big coils are required 3, 4, 5. The Earth's magnetic field at the surface is about 0.5 Gauss. The current used in the calculation above is the total current, so for a coil of N turns, the current used is Ni where i is the current supplied to the coil. = m, the magnetic field at the center of the loop isĪt a distance z = m out along the centerline of the loop, the axial magnetic field is B = x 10^ Tesla = Gauss. Which in this case simplifies greatly because the angle =90 ° for all points along the path and the distance to the field point is constant. The form of the magnetic field from a current element in the Biot-Savart law becomes HyperPhysics***** Electricity and Magnetism Stacking multiple loops concentrates the field even more into what is called a solenoid. Magnetic Field of a Current Loop Magnetic Field of Current Loop Examining the direction of the magnetic field produced by a current-carrying segment of wire shows that all parts of the loop contribute magnetic field in the same direction inside the loop.Įlectric current in a circular loop creates a magnetic field which is more concentrated in the center of the loop than outside the loop.
