SHS2 Physics · Semester 2 Week 11: Electromagnetism

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.3 - Describe force on a moving charged particle in a crossed field (Lorentz force).

By the end of the lesson, learners can:

Define a crossed field as a region where electric and magnetic fields are perpendicular to each other.
Explain how the electric field and magnetic field each act on a moving charged particle, stating the direction of each force.
Describe the resultant motion of a charged particle in a crossed field when the electric and magnetic forces balance and when they do not balance.
Apply the concept of the Lorentz force to explain a practical device, such as a velocity selector or a cathode ray tube.
Use the right-hand rule to predict the direction of the magnetic force on a moving positive charge in a crossed field setup.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Electromagnetism (3.2)
Content standard: 2.3.2.CS.3 - Demonstrate knowledge and understanding of the force exerted on a charged particle moving in electric and magnetic fields, and their applications 2.3.2.LO.3 Demonstrate knowledge of the relationship between the magnetic field and the electric field.
Indicator: 2.3.2.LI.3 - Describe force on a moving charged particle in a crossed field (Lorentz force).
Suggested placement: Semester 2, Week 11 (Week 31 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 130

Exemplars (from the NaCCA curriculum)

Experiential Learning: Using video simulations describe how the electric and magnetic fields affect the acceleration and direction of the charge respectively. Learners describe a crossed field.
Recognise diverse talents and perspectives.
Assessment (2.3.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Laptop/ Computer
- Projector
- Internet
- Simulation lab software
- Science kit set