Translations

Code	Language		Translator	Run

Credits

Wolfgang Christian; Tan Wei Chiong

1. Overview:

This document summarizes the key information about a JavaScript-based simulation designed to teach Faraday's Law of electromagnetic induction. The resource is part of the Open Educational Resources / Open Source Physics @ Singapore project. The simulation allows users to visualize the relationship between magnetic fields and electric fields, and how they produce an electromotive force (e.m.f.).

2. Key Themes and Ideas:

• Faraday's Law: The primary focus is to illustrate Faraday's Law, described as "one of the fundamental laws of electromagnetism." The simulation aims to show how a changing magnetic field creates an electric field.
• Electromagnetic Induction: The simulation is centered on the concept of electromagnetic induction, demonstrating how a magnetic field interacting with a conductor (a straight wire moved across parallel wires in this case) generates an electromotive force.
• Visualization: The simulation uses a visual representation to explain a complex scientific concept. It shows a wire moving in a magnetic field (either into or out of the screen) and displays an emf-time graph.
• Interactive Learning: The simulation allows users to interact with the parameters of the magnetic field, "you can vary the magnetic field B(x,t) by adjusting the formula expressing the magnetic field," which promotes active learning and experimentation.
• Educational Resource: The applet is explicitly intended as a teaching tool, providing a virtual environment for students to explore and understand electromagnetic induction. It includes "Sample Learning Goals."
• HTML5 and JavaScript: The simulation is built using HTML5 and JavaScript, making it accessible through web browsers without requiring additional plugins.

3. Specific Features and Functionality:

• The simulation features a straight wire moving across parallel wires in a magnetic field.
• The magnetic field can be directed "into the screen (blue) or out of the screen (red)."
• The simulation displays an "emf-time graph" to visualize the electromotive force generated.
• Users can adjust the formula defining the magnetic field (B(x,t)) to explore different scenarios.
• The time in the simulation runs faster than real-time.

4. Intended Audience:

The simulation is designed "For Teachers" to use as an educational tool for physics students learning about electromagnetism and Faraday's Law. It's also suitable for independent student exploration.

5. Credits and Versions:

• The simulation was created by Wolfgang Christian and Tan Wei Chiong.
• The document cites different versions: "improved version with joseph chua's inputs" and an "original simulation by lookang."

6. Related Resources

The page also provides links to a diverse range of other physics and math related simulation applets, along with resources and events, suggesting a broader commitment to interactive, open-source educational tools.

7. License:

The content is licensed under the Creative Commons Attribution-Share Alike 4.0 Singapore License. Commercial use of the EasyJavaScriptSimulations Library requires contacting fem@um.es directly.

 

Faraday's Law Simulation Study Guide

I. Key Concepts

• Faraday's Law of Electromagnetic Induction: The fundamental law of electromagnetism describing how a changing magnetic field creates (induces) an electromotive force (EMF), which is a voltage.
• Electromotive Force (EMF): The voltage generated by a changing magnetic field or magnetic flux. It drives current in a circuit.
• Magnetic Field (B): A region around a magnet or electric current in which a magnetic force is exerted on moving electric charges and magnetic dipoles.
• Magnetic Flux: A measure of the quantity of magnetism, taking account of the strength and extent of a magnetic field.
• Simulation: A digital model that imitates the behaviour of a real-world process or system, allowing for experimentation and visualization.
• HTML5 Applet: A small application written using HTML5, CSS, and JavaScript, designed to run within a web browser.

II. Quiz

Answer each question in 2-3 sentences.

1. What is the main principle that the Faraday's Law simulation demonstrates?
2. According to the simulation's description, what two fields interact to produce an electromotive force (EMF)?
3. How does the simulation visually represent the direction of the magnetic field?
4. How can users of the simulation manipulate the magnetic field?
5. What does the emf-time graph in the simulation represent?
6. What does the simulation use to represent the straight wire being moved across the parallel wires?
7. What are some of the other simulation resources available?
8. Give an example of another physics subject that has its own simulation, according to the list at the end of the text.
9. In what formats are the simulations accessible?
10. What is the overall purpose of the simulation?

Answer Key:

1. The simulation demonstrates Faraday's Law of electromagnetic induction, showing how a changing magnetic field induces an electromotive force (EMF).
2. The simulation shows the interaction of a magnetic field and an electric field.
3. The magnetic field is visually represented with blue indicating the field is facing into the screen and red indicating it is facing out of the screen.
4. Users can vary the magnetic field B(x,t) by adjusting the formula that expresses the magnetic field.
5. The emf-time graph represents the electromotive force generated over time as the wire moves through the magnetic field.
6. The straight wire is moved across a pair of parallel wires, in a magnetic field that is either facing into the screen (blue) or out of the screen (red).
7. There are many other resources available, including simulations on vector addition, ripple tanks, black-body radiation, Millikan Oil Drop experiment, and more.
8. There are simulations for Kinematics, Momentum, Optics, and even more physics concepts.
9. The simulations are accessible in JavaScript HTML5 format.
10. The overall purpose of the simulation is to provide an interactive and visual tool for understanding Faraday's Law and electromagnetic induction.

III. Essay Questions

Answer these questions in a well-structured essay format.

1. Discuss the significance of Faraday's Law in the broader context of electromagnetism and its applications in modern technology.
2. Explain how simulations like the Faraday's Law applet can enhance the learning experience compared to traditional methods of teaching physics.
3. Describe the relationship between the magnetic field, the motion of a conductor, and the induced electromotive force (EMF) as illustrated by the simulation.
4. Analyze the limitations of the simulation in accurately representing real-world scenarios involving electromagnetic induction.
5. How can Open Source Physics simulations make the learning experience more accessible and engaging for diverse learners?

IV. Glossary of Key Terms

• Electromagnetic Induction: The process of generating an electromotive force (EMF) in a circuit by varying the magnetic flux through the circuit.
• Electromotive Force (EMF): A voltage generated by a changing magnetic field or by a battery or generator. It is the "force" that drives current in a circuit, measured in volts.
• Magnetic Field (B): A vector field that describes the magnetic influence of electric currents and magnetic materials. Measured in Tesla (T).
• Magnetic Flux (Φ): A measure of the total magnetic field that passes through a given area. It is calculated as the product of the magnetic field strength and the area, and is measured in Weber (Wb).
• Faraday's Law: States that the induced electromotive force (EMF) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit. Mathematically expressed as: EMF = -dΦ/dt.
• JavaScript: A scripting language commonly used to create interactive effects within web browsers.
• HTML5: The latest evolution of the standard that defines HTML. It is used for structuring and presenting content on the World Wide Web.
• Applet: A small application, often written in Java or JavaScript, that runs within another application, typically a web browser.
• Open Source Physics (OSP): A collaborative project dedicated to creating and sharing computer simulations and resources for physics education.
• Simulation: The imitation of the operation of a real-world process or system over time.

Sample Learning Goals

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For Teachers

This simulation illustrates Faraday's Law of electromagnetic induction, predicting how a magnetic field interacts with an electric field, producing an electromotive force (e.m.f.). Faraday's Law is one of the fundamental laws of electromagnetism.

In this simulation, a straight wire is moved across a pair of parallel wires, in a magnetic field that is either facing into the screen (blue) or out of the screen (red).
The emf-time graph is represented by the graph above the experimental setup and you can vary the magnetic field B(x,t)by adjusting the formula expressing the magnetic field.
The time t is measured in seconds, but do take note that the time in the simulation is faster than real-time.

Research

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Video

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 Version:

1. http://weelookang.blogspot.sg/2016/02/vector-addition-b-c-model-with.html improved version with joseph chua's inputs
2. http://weelookang.blogspot.sg/2014/10/vector-addition-model.html original simulation by lookang

Other Resources

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Frequently Asked Questions about the Faraday's Law Simulation Applet

• What is Faraday's Law and why is it important?
• Faraday's Law of electromagnetic induction is a fundamental law of electromagnetism that describes how a changing magnetic field creates an electromotive force (EMF), which can drive an electric current. This law is critical for understanding the operation of many devices, including generators, transformers, and inductors.
• What does this simulation demonstrate?
• This simulation demonstrates Faraday's Law by visualizing the interaction between a moving straight wire and a magnetic field. As the wire moves across parallel wires within a magnetic field, an EMF is induced, resulting in current flow in the loop formed by the moving and parallel wires. The simulation allows users to observe and understand how the magnetic field affects the electric field and the resulting EMF.
• How can the magnetic field be adjusted within the simulation?
• The magnetic field B(x,t) in the simulation can be varied by adjusting the formula that defines it. This allows users to explore how different magnetic field strengths and configurations affect the induced electromotive force (EMF).
• What does the graph in the simulation represent?
• The graph above the experimental setup represents the EMF as a function of time. This visual representation allows users to observe how the EMF changes as the wire moves and as the magnetic field changes.
• Is the simulation real-time?
• No, the time in the simulation is faster than real-time. This allows users to observe the effects of Faraday's Law more quickly and efficiently.
• Who created this simulation?
• The simulation was created by Wolfgang Christian and Tan Wei Chiong.
• Where can I find other interactive physics resources?
• The Open Educational Resources / Open Source Physics @ Singapore website offers a variety of interactive resources for learning physics, covering topics from kinematics and mechanics to electromagnetism and quantum physics.
• Can I embed this simulation in a webpage?
• Yes, the simulation can be embedded in a webpage using the provided iframe code. This allows educators and students to easily integrate the simulation into their own online learning materials.