Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Explain the force on a moving charged particle in an electric field.
• Describe how electric and magnetic fields affect a particle's motion.
• Calculate the force on a particle using the Lorentz force equation.
• Analyze the effects of charge, velocity, and field direction.
• Understand the concept of crossed fields.

Lesson summary

Welcome, future engineers, doctors, and scientists! Today, we delve into a fascinating aspect of physics called electromagnetism. We will explore the invisible forces that act on charged particles when they move through magnetic and electric fields. This is not just abstract science; it's the principle behind the old box televisions (CRT TVs) many of our families used, the technology in our major hospitals like Korle Bu for seeing inside the human body (MRI scans), and even how scientists at institutions like Noguchi analyse tiny particles. Understanding these forces is key to understanding much of the technology that powers our modern world. Curriculum Details:

Lesson notes

This topic builds on our previous knowledge of electric and magnetic fields. The key new idea is that a magnetic field only exerts a force on a charge if the charge is moving. A stationary charge feels no force from a static magnetic field. Part A: Force on a Moving Charge in a Magnetic Field

When a particle with charge `q` moves with velocity `v` through a magnetic field of strength `B`, it experiences a magnetic force `F_B`. The magnitude of this force is given by the formula:

F B = qvB sin(θ)

Where: F B is the magnetic force, measured in Newtons (N). q is the magnitude of the charge, measured in Coulombs (C). The charge of a single proton or electron is `1.6 x 10⁻¹⁹ C`. v is the speed of the particle, measured in metres per second (m/s). B is the strength of the magnetic field (also called magnetic flux density), measured in Tesla (T). θ (theta) is the angle between the direction of the particle's velocity (`v`) and the direction of the magnetic field (`B`).

Evaluation guide

• Explain f orce on a moving charged particle in an electric field.
• Experiential Learning: Using video simulations explain the main factors that affect charged particle s
• moving in the magnetic field i.e., the direction of the field, the direction of the particle and the charge of
• conceptual