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Essential idea: The effect scientists call magnetism arises when one charge moves in the vicinity of another moving charge.
Nature of science:
Models and visualization: Magnetic field lines provide a powerful visualization of a magnetic field. Historically, the field lines helped scientists and engineers to understand a link that begins with the influence of one moving charge on another and leads onto relativity. (1.10)
Understandings:
Magnetic fields
Magnetic force
Applications and skills:
Determining the direction of force on a charge moving in a magnetic field
Determining the direction of force on a current-carrying conductor in a magnetic field
Sketching and interpreting magnetic field patterns
Determining the direction of the magnetic field based on current direction
Solving problems involving magnetic forces, fields, current and charges
Guidance:
Magnetic field patterns will be restricted to long straight conductors, solenoids, and bar magnets
Data booklet reference:
F=qvBsinθ
F=BILsinθ
Problem Sets and Notes
Problem Sets and Notes
International-mindedness:
The investigation of magnetism is one of the oldest studies by man and was used extensively by voyagers in the Mediterranean and beyond thousands of years ago
Theory of knowledge:
Field patterns provide a visualization of a complex phenomenon, essential to an understanding of this topic. Why might it be useful to regard knowledge in a similar way, using the metaphor of knowledge as a map – a simplified representation of reality?
Utilization:
Only comparatively recently has the magnetic compass been superseded by different technologies after hundreds of years of our dependence on it
Modern medical scanners rely heavily on the strong, uniform magnetic fields produced by devices that utilize superconductors
Particle accelerators such as the Large Hadron Collider at CERN rely on a variety of precise magnets for aligning the particle beams
Aims:
Aims 2 and 9: visualizations frequently provide us with insights into the action of magnetic fields; however, the visualizations themselves have their own limitations
Aim 7: computer-based simulations enable the visualization of electromagnetic fields in three-dimensional space
Resources
Resources
In-Class Activities
In-Class Activities
Deflection of Electrons in a CRT - DEMO
Magnets Falling thru a Tube - DEMO
Forces on a wire - DEMO
Force on a Current-Carrying Conductor in a Magnetic Field - PIVOT
Mass Spectrometers
Formative:
Formative:
Submit PDF to Google Classroom for Feedback.
2016_Topic_5.4_Sample_Exam_Problems.pdfNOTES:
NOTES:
2016_Topic_5_Notes_5.4.pdfAdditional Resources:
Additional Resources:
Kognity - Chapter 5.4: Magnetic Effects of Electric Currents - Use your ACS Login
OpenStax - Magnets
Magnetism and the RHR - Slide Presentation
Important Vocabulary - Quizlet of Topic 5 Vocab
The Physics Classroom - Magnetism Interactive
5.4: Magnetic Effects of Electric Currents - Video Series
IB Physics Site: Topic 5 Notes -Scroll to 5.4
Khan Academy - Magnetic Fields
Extensive Notes (ppt)
Magnetic Fields and Electric Induction
Magnetic Fields and Electric Induction
Check for questions in presentation below.
ElectroMagnetism Question
ElectroMagnetism Question
A strip of aluminum foil is held between the poles of a strong magnet, as shown.
When a current is passed through the aluminum foil in the direction shown, the foil is deflected. In which direction is this deflection?
A. Vertically downwards
B. Vertically upwards
C. Towards the North pole of the magnet
D. Towards the South pole of the magnet
Please include in your notes an explanation of the phenomena demonstrated in class.
1 Hz Oscillation
10 Hz Oscillation
St. Louis Motor
St. Louis Motor
A motor as boring as the city...
The St. Louis Motor works by the concept of induction - inducing or creating an electrical current from mechanical energy and vise versa. As an electrical current runs through a wire, it creates a magnetic field. The bar magnets on the motor serve to attract and repel the induced magnetic field in the wire. As a result, the motor spins. This is a conversion of electrical energy (from the battery) to mechanical energy (the motor moving). The beautiful thing about this motor is that it works in reverse too! You can create an electrical current from the mechanical energy you create by moving the rotor.
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