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Unformatted text preview: Brian Sek May 14, 2009 Physics 4BL, Lab 7 Lab Partner: Morgan Fryar Magnetism I ntroduction The purpose of this experiment is to investigate magnetic fields generated by steady-state sources. The first part is to measure the strength of the magnetic fields produced by currents using a Hall probe and to verify the prediction of the Biot-Savart Law for a long, straight current-carrying. The second part is to measure the magnetic field produced by a magnet. The third part’s objective is to verify that the force between dipoles is proportional to 1/d 4 . The last part of the experiment is to verify Faraday’s Law by measuring voltage induced in a coil of wire due to a varying flux through the coil generated by a sinusoidal current though a solenoid. Experimental Results Part 1: Magnetic Fields Produced by Line Currents A Hall probe Gaussmeter, clamped onto a linear track, is used to measure the perpendicular component of the magnetic (B) field. The B field measured was constant at different heights and points along the asmuth, while keeping radial distance constant. The radial field strength was measured at 20 different positions, with the first point being inside the conductor at 3 cm, and the last point being outside, at 24.2 cm. The voltage applied to the conductor was recorded. A graph was plotted, and then linear regression was performed to find the correlation coefficient to verify that the B field is inversely proportional to the radial distance. If the probe was aligned so that it was parallel to the field, the reading would stay 0. Figure 1 Voltage: 8.89 V The x-axis in Figure 1 represents the radial distance from the center of the inner conductor. This plot demonstrates that, for some distances in between the radius of the inner conductor and outer conductor, the magnetic field strength (T) in the y-axis is inversely proportional to the radial distance. There was almost no field inside the inner and outside the outer conductors. That is because there is no enclosed current in these two regions....
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This note was uploaded on 11/12/2010 for the course PHYSICS 4B 318017201 taught by Professor Carter during the Spring '10 term at UCLA.
- Spring '10