Electromagnetism · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.1 - Explain the forces acting between parallel conductors carrying current in a magnetic field.

By the end of the lesson, learners can:

State that two parallel current-carrying conductors exert a magnetic force on each other due to the interaction of their magnetic fields.
Explain, using diagrams, why currents in the same direction attract and currents in opposite directions repel.
Determine the direction of the force between two parallel conductors using the right-hand grip rule and Fleming’s left-hand rule.
Describe a simple laboratory or virtual demonstration that shows the attractive and repulsive forces between parallel conductors.
Justify, through reasoning, why the force between conductors is used in the definition of the ampere and in practical devices.

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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.2 - Demonstrate knowledge and understanding of the forces set up between parallel current-carrying conductors in a uniform magnetic field and applications. 2.3.2.LO.2 Demonstrate the repulsive and attractive forces between parallel current-carrying conductors in a magnetic field.
Indicator: 2.3.2.LI.1 - Explain the forces acting between parallel conductors carrying current in a magnetic field.
Suggested placement: Semester 2, Week 7 (Week 27 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. 128

Exemplars (from the NaCCA curriculum)

Experiential Learning: Demonstrate the repulsive and attractive forces between parallel current- carrying conductors in a magnetic field using simulation or laboratory set-up for learners in mixed- ability groupings.
Ensure that the teaching materials, examples, and illustrations reflect diverse perspectives.
Assessment (2.3.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Audio visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory