Lesson 7: Magnetic Force on Moving Charges
Overview:
In this lesson, we will cover the fourth fundamental force in nature and explore the similarities and differences with the other forces we have studied earlier.
Curriculum Expectations:
Overall Expectations:
D2. Investigate, in qualitative and quantitative terms, gravitational, electric, and magnetic fields, and solve related problems.
Specific Expectations:
D2.1 Use appropriate terminology related to fields, including, but not limited to: forces, potential energies, potential, and exchange particles.
D2.4 Analyze, and solve problems involving, the force on charges moving in a uniform magnetic field (e.g., the force on a current-carrying conductor or a free electron).
D2.5 Conduct a laboratory inquiry or computer simulation to examine the behaviour of a particle in a field (e.g., test Coulomb’s law; replicate Millikan’s experiment or Rutherford’s scattering experiment; use a bubble or cloud chamber).
D3.3 Use field diagrams to explain differences in the sources and directions of fields, including, but not limited to, differences between near- Earth and distant fields, parallel plates and point charges, straight line conductors and solenoids.
D2. Investigate, in qualitative and quantitative terms, gravitational, electric, and magnetic fields, and solve related problems.
Specific Expectations:
D2.1 Use appropriate terminology related to fields, including, but not limited to: forces, potential energies, potential, and exchange particles.
D2.4 Analyze, and solve problems involving, the force on charges moving in a uniform magnetic field (e.g., the force on a current-carrying conductor or a free electron).
D2.5 Conduct a laboratory inquiry or computer simulation to examine the behaviour of a particle in a field (e.g., test Coulomb’s law; replicate Millikan’s experiment or Rutherford’s scattering experiment; use a bubble or cloud chamber).
D3.3 Use field diagrams to explain differences in the sources and directions of fields, including, but not limited to, differences between near- Earth and distant fields, parallel plates and point charges, straight line conductors and solenoids.
Success Criteria:
- What is the SI unit for a tesla?
- Which of the following forces depend on the speed of a charge: magnetic, electric, or gravitational?
- What is the right hand rule for a moving charge in a magnetic field?
- If the velocity is south, the magnetic field East, in what direction will the magnetic force be directed? (i) For a positive charge, (ii) For a negative charge.
- What are two characteristics that separate the magnetic force from the other forces we have studied?
Time Allocation: 3 hours
Learning Activities:
Read pages 386 - 390 from Nelson 8.2
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Magnets and Electromagnets
Explore the interactions between a compass and bar magnet. Discover how you can use a battery and wire to make a magnet! Can you make it a stronger magnet? Can you make the magnetic field reverse? |
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In the playlist below, video:
- Will show you how to find the direction of the forces of a charged particle in 8 different magnetic fields using the right-hand rule or left-hand rule.
- Will calculate the magnitude and direction of the acceleration of a charged particle in a magnetic field.
Practice questions 1 and 2 on page 390.
Task:
Solve questions 2, 4, 6, and 8 from Nelson 8.2 Review on page 391.
Optional Extension:
Optional Extension:
- Solve question 10 on page 391.
Reflect:
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Real World Telekinesis
This video will feature the leading physicist Neil Turok, and give you an overview of the different types of fields, and one interpretation of how to think of them. |
Additional Resources:
In this final segment on the four fundamental forces of physics, Hank tackles the magnetic force, the second of the two ways in which electromagnetism is apparent in the universe.
