Electromagnetism · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.2 - Discuss the factors that affect the magnitude of the magnetic force on a current-carrying conductor in a magnetic field.

By the end of the lesson, learners can:

State the formula for the magnetic force on a current-carrying conductor as F = BIl sinθ and identify each symbol with its correct unit.
Discuss at least three factors (magnetic flux density, current, length of conductor, and angle between conductor and field) that affect the magnitude of the magnetic force, explaining how each factor influences the force.
Calculate the magnetic force on a current-carrying conductor using F = BIl sinθ for given values of B, I, l, and θ.
Determine the angle θ at which the magnetic force is maximum or zero, and justify the answer using the sine function.
Apply the concept of magnetic force on conductors to explain a practical situation, such as the working principle of a simple electric motor or a loudspeaker.

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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.1 - Demonstrate knowledge and understanding in analysing the factors that affect the magnetic force on conductors carrying current in a uniform magnetic field. 2.3.2.LO.1 Explain the how current is affected Personal and by the magnetic field using rules and Thinking calculations.
Indicator: 2.3.2.LI.2 - Discuss the factors that affect the magnitude of the magnetic force on a current-carrying conductor in a magnetic field.
Suggested placement: Semester 2, Week 6 (Week 26 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. 126

Exemplars (from the NaCCA curriculum)

Talk for Learning: Calculate the force on a current-carrying conductor in a magnetic field using F= BIl Sinθ
Encourage the appreciation and valuing of the skills and abilities of individuals from diverse backgrounds, including gender, race, ethnicity, socioeconomic status, and disabilities.
Assessment (2.3.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Laptop/Computer
- Projector
- Internet
- Simulation lab software
- Flash cards
- Science kit set
- Magnets
- Iron filings