Lab 2 (1)

docx

School

University of San Francisco *

*We aren’t endorsed by this school

Course

4322

Subject

Physics

Date

Dec 6, 2023

Type

docx

Pages

Uploaded by SuperMooseMaster884

Dear Mr. President , In case you were ever curious, our physics lab group (103) made an experiment to answer the research question : Does a magnet’s distance affect its field strength reading? Wolfon, in the textbook Essential University Physics , gives us a way to measure field strength with the concept of electric flux. Flux is the flow rate of electric charge per unit area and is described by the equation Φ = EAcosθ (Wolfon 2020). Therefore, when a magnet’s distance is changed, so too should the field strength of its electric field. Here's how the experiment to prove this was designed: Method: 1. Place the phone flat on a table. 2. Clear away any objects with magnetic fields, including speakers and other phones. 3. Calibrate the phone by moving it in a figure 8 pattern. 4. Mark on taped down paper 10 cm on the side of the phone with strongest readings (in our case, the left side of the phone) following the x-axis. This will be the path for the magnet. 5. Starting at the 10 cm mark (furthest point from the phone), place the magnet on the flat service and record the magnetic force at 1 cm intervals until you reach 1cm away from the phone. 6. Have another student repeat the steps listed above. phyphox’s axes

Figure 1 (10 cm away) Figure 2 (1 cm away) Figure 3 Results: In this experiment, the phone’s internal MEMS magnetic field sensor used the Hall Effect . According to Trenovision.com , The Hall Effect is a phenomenon where a metal plate in a magnetic field will make electrons disperse with one side positive and the other negative. As a result, this produces a voltage which is what the phone reads. A phone app called PhyPhox utilized this effect and live-tested the magnetic field strength, giving us Figures 1-3 above. The graphs represent the Tesla in a specific axis. As shown, the closer the magnet was to the phone, the higher the magnetic flux. More specifically, the limits for the x axis data were 7.53 B(uT) for the closest reading to the phone in terms of distance, while 5.64B(uT) was the furthest at 10 cm

away. Additionally, the Chi-squared value we got for this experiment was 11.6. We triple checked our formulas and data to make sure everything was inputted correctly yet our chi squared value was very far from 1, what does that say about our experiment? We can conclude from our findings that the devices used to record and gather data were not made for such precise measurements. If we were to perform this experiment again, we would only change the tools used to gather our data, and that should bring our chi squared value closer to 1. Conclusion: From the results gathered, we can conclude that distance does affect the magnetic field strength of a magnet. As supported by toppr.com , Magnetic field strength is determined by the ratio of “MMF” (magnetomotive force) (Toppr 2021). MMF constitutes a flux density and this value decreases as the distance increases between a magnet and a current. This correlation between magnetic flux and MMF is comparable to that of Ohm’s Law, which states that the current that flows (in conductors) is directly proportional to that of the voltage it receives ( byjus.com ).This can explain Tesla strength as values from the phone's magnetometer are based on the varying voltage outputs of the magnet which is dependent on the distance of the magnet to the phone. Therefore, as our research and results support, distance does affect the magnetic field strength of a magnet. Thank you, Alina Mortazavi Cristian Gutierrez Bree Dineley Citations

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Toppr Guides. (2021). Magnetic Field Strength Formula . Toppr. https://www.toppr.com/guides/ physics-formulas/magnetic-field-strength-formula/ phyphox (1.1.7). (2020). [Data Collection]. RWTH Aachen University. https://phyphox.org/ BYJU Study App. (2021). Ohm’s Law . BYJU. https://byjus.com/physics/ohms-law/ Wolfson, R. (2020). Essential university physics . Harlow, United Kingdom: Pearson. Holmes, N. G. (Aug 2020) Statistics Summary .

Related Documents

PHY122_Newtons2ndLaw_worksheet.pdf

Lab 1 A Law of Electrostatic Force.pdf

120-lab-manual(1).docx

PHY 132 - e_m of the Electron worksheet.pdf

PHYS_Lab_Report_6.pdf

F23_Lab 7-2.pdf

Exam II Sp2016-Science 25.docx

Fall-2013-Sci-25-Exam-II (1).docx

AST 151 Lab Assignment - Mercury's Orbit and Kepler's Laws.docx

Kaley_Sechler_Lab05.docx

lab report 5 questions.docx

Lab Report M0.docx

Recommended textbooks for you

University Physics Volume 2

Physics

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Physics for Scientists and Engineers: Foundations...

Physics

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Cengage Learning

Physics for Scientists and Engineers, Technology ...

Physics

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Cengage Learning

Principles of Physics: A Calculus-Based Text

Physics

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Cengage Learning

College Physics

Physics

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Cengage Learning

Glencoe Physics: Principles and Problems, Student...

Physics

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Glencoe/McGraw-Hill

SEE MORE TEXTBOOKS

Recommended textbooks for you

University Physics Volume 2
Physics
ISBN:9781938168161
Author:OpenStax
Publisher:OpenStax
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
Glencoe Physics: Principles and Problems, Student...
Physics
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Glencoe/McGraw-Hill