Lab 7 Worksheet PHY 112

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Rio Salado Community College *

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112

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Mechanical Engineering

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Apr 3, 2024

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PHY112 Lab 7 Name: Force on a Wire Section: Download and open the Lab 7 Excel Simulation. You may receive a notification that macros are disabled. You can disable the macros, or you can change the direction of the battery and magnet manually by clicking on the drop-down in the appropriate cells. If you change these manually, the simulation diagrams will no longer match. Part 1 – Observations 1. What is the weight of the magnet? 2. Set the magnetic field strength to 0.2 T , the current in the wire to 1.0 A , and the length of the wire to 0.01 m. Use the flip battery and flip magnet buttons to change the direction of the battery and magnet. Create each of the following arrangements, and record your observations in the data table below. Direction of the magnetic field Direction of the current in the field Direction of the force on the wire Reading on the scale increased or decreased - z Left -y Increased 0.002N - z Right -y Decreased 0.002 N + z Left +y Decreased 0.002 N + z Right +y Increased 0.002 N The weight of the magnet is 120N or 27.3lbs Conversion from newtons to pounds: 120N = 1lb/4.4N = 27.3lbs

What conclusions can you draw from these observations? Be specific. 3. Enact each of the changes shown below on the system. Record your qualitative observations on the data table below. Make sure that you change the system one variable at a time (do not change all three at the same time). Change to system Force on wire increases or decreases Increase magnetic field strength increases Increase current in the wire increases Increase length of wire in the field increases Part 2 – Data Collection 4. In this section, you will collect three sets of data and produce a graph for each data set. Complete each of the data tables, and create a properly labeled graph. Remember, change only one variable at a time while holding all other variables constant. Force versus magnetic field strength Magnetic field strength ( T ) Force on the wire ( N ) 0.2 0.002 0.4 0.004 0.6 0.006 0.8 0.008 From these observations, I can conclude that depending on the location and direction of the battery and the magnet, the force acting on the magnet will either increase or decrease by 0.002 N.

1.0 0.01 5. Create a scatter plot of the data. Apply a linear fit and include the equation. Properly label the graph, and copy and paste it below. 6. According to the graph, what is the relationship between force on a wire and magnetic field strength? If the magnetic field strength doubles, what happens to the force on the wire? 7. Force versus current in the wire Current in the wire ( A ) Force on the wire ( N ) 1.0 0.002 3.0 0.006 6.0 0.012 9.0 0.018 12.0 0.024 The relationship between force on a wire and magnetic field strength is that as the magnetic field strength increases, the force on the wire also increases. We can see on the graph a positive linear correlation. When the magnetic field strength doubles, the force on the wire also doubles. We can see that when the magnetic field strength was 0.2T the force on the wire was 0.002N. We the magnetic field strength was double to 0.4T the force on the wire also double and we got 0.004N.

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8. Create a scatter plot of the data. Apply a linear fit and include the equation. Properly label the graph, and copy and paste it below: 9. According to the graph, what is the relationship between force on a wire and current in the wire? If the current in the wire doubles, what happens to the force on the wire? 10. Force versus length of wire in field Length of wire in field ( m ) Force on the wire ( N ) 0.01 0.002 0.02 0.004 0.03 0.006 0.04 0.008 0.05 0.01 11. Create a scatter plot of the data. Apply a linear fit and include the equation. Properly label the graph, and copy and paste it below: The relationship between force on a wire and current in the wire is that as we increase the current in the wire, the force on the wire also increases. We see a positive linear relationship on our graph and data table. If the current in the wire doubles, the force on the wire also doubles. For example, when the current in the wire was 3A, the force on the wire was 0.006N. When we double the current to 6A, the force on the wire doubled to 0.012N.

12. According to the graph, what is the relationship between force on a wire and length of wire in the field? If the length of the wire in the field doubles, what happens to the force on the wire? Part 3 – Analysis Use your data and graphs to answer each of the following questions: 13. Look up the accepted equation for force on a current bearing wire. How do your results compare? Be specific. The relationship between force on a wire and length of wire in the field is that as the length of the wire field increases, the force on the wire also increases. We can see on our graph a positive linear correlation between these two variables. If the length of the wire in the field doubles, the force on the wire also doubles. For example, when the length of the wire is 0.01m, the force on the wire is 0.002N. When the length of the wire doubles to 0.02m the force on the wire also doubles to 0.004N. The accepted equation for force on a current bearing wire is F = IL x B. Where F is force, I is current, L is the length of the wire and B is the magnetic field strength. My results are perfectly compatible with this equation. As we increased the length of the wire, the current on the wire, and the magnetic field strength, we also saw an increase in the force on the wire. If we were to decrease the magnetic field strength, then the force on the wire would also decrease which would also be the same result if we were to decrease the current and/or length of the wire.