# Experiment 8 Lab Report (PHYS 1440).docx - Experiment 8...

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Experiment 8: Magnetic Field in a Current Carrying Coil Savannah Davis PHYS 1440 SEC: 503 11-11-2020
Magnetic Field in a Current Carrying Coil Savannah Davis *Physics Laboratory, Department of Physics, University of North Texas, 1155 Union Circle, #311427, Denton, Texas 76203 11 November 2020 Abstract The objective of this experiment is to compare changes in the axial and radial magnetic field as the position of a magnetic field sensor is moved through a current carrying coil. This will be achieved by comparing the measured values with those obtained by the long and short solenoid equations. It was determined that the current carrying coil in this experiment is most likely a short solenoid as the measured value was closest to the calculated short equation. It is important to determine the type of coil in order to better understand the axial and radial components and the magnetic field as a whole. This understanding can be applied to everyday uses of magnetic fields, such as compasses and electric motors, in order to improve efficiency and usage. Introduction Electron under potential difference in a wire cause current to flow. Current flow is associated with moving charges that in turn create a magnetic field. Magnetic field can be recorded in two components, axial and radial. The below figure shows how a magnetic field moves through a solenoid, the field line travel from the bottom to the top always flowing from north to south. The following equation is used to determine the magnetic field along the perpendicular axis through the center of a short solenoid. N is the number of turns, μ 0 is the permittivity of free space, R is the
radius of the coil, I is the current through the coil and x is the distance from the center of the coil. To use