Question

Radius (m)	Radial Magnetic Field (μT)	Axial Magnetic Field (μT)
0	3.0 + .2	31 + 2
0.01	2.5 + .1	32 + 2
0.02	1.3 + .07	33 + 2
0.03	2.4 + .1	34 + 2
0.04	-3.8 + .2	36 + 2
0.05	-5.0 + .3	34 + 2
0.06	-12.0 + .3	37 + 2
0.07	-17.0 + .9	44 + 2
0.08	-16.0 + .8	51 + 3
0.11	-30 + 2	-60 + 3
0.12	-8.0 + .4	-45 + 2
0.13	-8.0 + .4	-23 + 1
0.14	-7.6 + .4	-17 + 1
0.15	-6.0 + .3	-14 + 1
0.16	-3.0 + .2	-13 + 1
0.17	-1.8 + .1	-12 + 1
0.18	-4.0 + .2	-12 + 1
0.19	-4.0 + .2	-11 + 1
0.20	-4.7 + .2	-11 + 1

(Quick note: the plus signs should be plus or minus, to signify the uncertanties the values have)

In this experiment we are connecting a power supply to a coil. We are using the current I=0.3A and N=200. The procedure explains: "Measure B near the wire coil itself in the plane of the coil. Take data as a function of r (distance to the wire) both going toward the center of the loop and going away fom the axis. Does the equation B=µ0*N*I/2*pi*r give the correct magnitude for B? Over what range does B vary as 1/r?

The questions are: In one graph, plot axial and radial magnetic fields against radius. On the same graph, plot the theoretical prediction for the axial magnetic field using equation B=µ0*N*I/2*pi*r

+I am confused on how to plot the theoretical prediction for the axial magnetic field. This has to do with the fact that the signs of B reverse but when does that happen?

Answer 1