Lab 8 Physics 2

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University of Texas, El Paso *

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Electrical Engineering

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Dec 6, 2023

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Faradays Law

Introduction The aim of this lab was to confirm the prediction that the group will make using Faraday’s Law. This lab required the use of a magnets, coils and a magnetic field sensor. A magnet is any material that attracts iron or materials containing iron. From this experiment, it should be possible to test, record, and discuss observations of a change in magnetic field. This requires knowledge of the variables effecting magnetic fields and voltage induced in a coil. another variable includes physical movement of the magnet. The induced voltage should increase by 20% if we increase the magnitude of the magnetic field by 20%. We believe this because we believe the magnitude of the magnetic field is relative to the voltage induced and it should be a constant change. Successfully utilizing the aforementioned material should lead to the team to acquiring our prediction. Materials & Set-Up The lab should be set as shown. The coil should be mounted on a stand. Under the coil should be a cushion in a box to catch the magnet. Procedure  Set up your selected coil on a stand with a clamp. Grab it to the clamp so that the magnets can fall through the center of the coil.  Place the cushion box below to catch the magnet and prevent it from breaking.  Connect the voltage sensor on both ends of the coil.  Set up your Capstone page to have a voltage vs. time graph, and increase to 100Hz your sample rate.  Select a magnet to use as the baseline for later comparison.  Find the magnetic field value produced by each magnet by passing the magnet through the coil. It is important to ensure that the change in time of each magnet is the same each time a magnet passes through the coil.  Pass each magnet five consecutive times through the coil. Ensure that the same pole is going first each time.  This will be your value for the emf for the specific magnet. This will be your value for the emf for the specific magnet.  Find the percentage change (increase/decrease) for each of the two other magnets. Voltage sensor leads Magnetic field sensor 3 magnets coil

Data Table I: Setup values for the magnetic field Name Shape Magnetic Field % difference Base rectangle -32 Sample 1 cylinder -19 40 Sample 2 circle 116 471.9 These values were found by comparing the magnets to our base. Our base was the rectangular magnet Table II: Results of the emf induced in the coil for each magnet. Name Maximum Average emf % difference Base 0.09 Sample 1 0.176 95.5 Sample 2 0.168 86.67 Above shows the recorded data of all the magnets passing through the coil. Using the rectangle magnet as a base. Conclusions The results of the emf induced in the coil for the showed the cylinder had a greater percent difference. The setup values show the percent difference was greater for the circle magnet. The cylinder magnet increased in percent difference. The circle magnet decreased in percent difference. The ratio changes we not the same, even considering the 5% neglectable difference. These values do not support our prediction made at the beginning of the lab. Our prediction was that the change would be constant to the ratio of % difference for magnetic field to the % difference for emf. Personal Learning Experience I enjoyed working with magnets and the coil. It was interesting seeing the graphs that the magnets would produce. Our team attempted to do the extra credit. Our team changed the coil in order to induce the voltage by 20%. However, by changing the coil we actually induced the voltage by 50%. Our team was not able to come up with an effective way to change the time that the magnet would pass through the coil.

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