# Determining The Measurement Of The Local Magnetic Field

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Investigation
Up until 1830’s it was difficult to measure the magnetic field of the earth quantitatively, due to there were no real standard to compare it against. Geologists in that era had difficulties on navigating from point A to point B [2]. As electromagnetic theory was industrialized through the 1800s, it was found that magnetic field strength could be given a definite value using coils which carries the current. In this EEi, the aim is to determine the measurement of the local magnetic field, comparing to a known value created by a coil known its size, current and turns. [1]
With a compass on a bench in between 2 copper coiled PVC tube, it is possible to make the compass move towards east or west by placing a magnetic field at right angles to the compass direction. If it is possible to achieve moving the needle to move to 45o It means that the coils is the same magnitude as the Earth’s field – but acting in a right angle. [1]
Using the Biot-savart Law to determine the magnetic coil strength due to the coil:
BC = 8 μoNI/(R x 5√5)
Where N = number of turns on each coil (not the total), I is the current, R is the radius of the coil. The constant μo is the permeability of free space (4πx10-7 Tm/A). [1]
Aim
Using a designed apparatus by letting current pass through the copper wire around A PVC tube, generate electricity and measure the local magnetic field by comparing it to a known value created by a coil of known size, current, and turns.
Hypothesis
The Higher