We are connecting power supply with coil to produce magnetic field. Base on the know values such as current, turns of coil, and change of angle on the compass when the magnetic field created by the coil.
Recorded experiment data. In order to determine this we used the deflection of the compass at a know current and solved for the magnetic field of the earth by dividing the magnetic field of the coil by tangent of theta.
Once we fit a linear line onto our data that the slop of the data set would be the magnetic field of the earth which was about 1*10^-5 T.
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