Global Journal of Science Frontier Research, A: Physics and Space Science, Volume 22 Issue 1

v. Experimental design Figure 12: Apparatus and part summary for the pre-experiment a. Experimental setup 1. The magnet is tied to the spring to later fasten it with one of the three-pointed pliers to the universal support already assembled. 2. The coil of wire is placed on the heating plate and directly below the hanging magnet so that when the spring is fully stretched the magnet is surrounded by the coil. 3. The rule is secured to the universal support with the second three-prong clamp, taking care that it does not obstruct the movement of the spring. 4. The coil is heated to the desired temperature. 5. Before starting the experiment as such, a slow- motion video recording is started, so as to have a more accurate record of the oscillation time. b. Carrying out the experiment 6. The magnet is released with a minimal push force and as soon as it starts oscillating, the timer is activated. 7. Once the spring stops, the timer stops and the procedure is repeated four more times, so that a total of five repetitions are completed for the same temperature. Consequently, the electromagnet is heated to the same temperature as many times as necessary. 8. Steps 4 to 8 are repeated with an increase in temperature of approximately 5 degrees Kelvin, until having 10 measurements for each temperature with 5 repetitions. Using the Tracker program 9. Open the video file. 10. In the playback control bar, the selection of frames is made. 11. A coordinate axis is defined, taking the equilibrium position of the spring as the coordinate origin. 12. The calibration rod tool is selected and its ends are moved until the rod covers a certain length of the ruler, in order to have a scale with which the observable distances in the video can be compared with the real ones. 13. The object to be analyzed is defined, this being the spring. 14. The path of the mobile is specified. vi. Complications in the experiment This experiment was not incorporated into the present work after the identification of numerous significant sources of error. Likewise, their minimization required instruments and materials with very specific characteristics that were not available in the laboratory, apart from a much more rigorous experimental procedure. For example, there was the complication of defining at what point the magnet stopped because it continued to oscillate around its final position for long periods of time; in addition to the fact that manual time recording can result in human error. On the other hand, the initial thrust to the spring clearly varied from test to test, which could obscure the relationship between the variables investigated. As for the instruments, a better grip clamp was needed to keep the spring-magnet system in a fixed position because with the clamp used the spring began to swing from side to side, instead of oscillating vertically. Additionally, although the circumference of the electromagnet was envisioned to be greater than the cross-sectional area of the magnet, it collided with the coil due to its movement in the horizontal axis. But, the main reason that led to the rethinking of the experiment was that little difference was observed between the times that it took the magnet to oscillate with and without the heated coil, which could complicate the analysis of a correlation between the temperature of the coil and the force of braking produced by the currents induced in it. Relationship between Temperature and the Holding Force of an Electromagnet in a Changing Magnetic Field © 2022 Global Journals 1 Year 2022 28 Global Journal of Science Frontier Research Volume XXII Issue ersion I VI ( A ) c.