24 Magnetic Fields
This page covers the magnetic fields section of the course. It is worth realising that the iGCSE does not cover all the ideas that AQA 1-9 GCSE covers for this part of the course. Hence, it is worth going over things like FBI from formulae perspective unless you teacher did some extra ideas.
Resources
24 Magnetic Fields
24 Mag Fields Student Booklets
24.1 CPAC Style Long Answer Question
24.2 Student Worksheet Perin Tubes and More
24.3 Charge particles in Circular Orbits
24.3 Mass Spectrometer Questions
24.3 Cyclotron Exam Question
Title | What to do | Type |
Magnetic Field of a Straight Current-Carrying Wire | Change direction of current, see field lines, compass | Sim |
Charged particle in an magnetic field | Change field, charge, velocity, mass, see path of charge | Lab |
A charged particle moving in three dimensions | See spiral path of particle in magentic field, change, rotate view | Sim |
A cyclotron | Cyclotron, change electric/magnetic field, see path | Sim |
Charge Moving Through Magnetic Field Lab | Change charge, field, speed, see path of particle | Lab |
Mass spectrometer | Build up to mass spectrometer with velocity selector, accelerator, mass selector | Sim |
The force on a charged particle in a magnetic field | Change q, v, B, see paths of particles | Sim |
DC motor | Change field, p.d., number of loops, see forces, current | Sim |
Direct current electrical motor | Change direction, see current, force, field for LHR | Sim |
Lorentz force | Change current direction, field, see force on a wire | Sim |
Electric motor | See motor spin with force and field | Sim |
Electric motor quiz | Label an electric motor | Game |
Circuit construction kit – PhET | Build circuits with capacitors and inductors | Sim |
Mass Spectrometer 70-70F Manchester Science Museum
70-70F mass spectrometer, made by VG Micromass, Winsford, 1974 and used at the University of Oxford for research into the metabolites of cannabis, with associated manuals & research papers.
Carol Robinson ...is a chemist who has pioneered the application of mass spectrometry techniques to problems in chemical biology. Her groundbreaking research on the three-dimensional structure of proteins in particular has demonstrated the power of such techniques in studying large molecular compounds.
Much of her research has involved pushing the limits of electrospray mass spectrometry, demonstrating that important complexes can be generated and studied in the gas phase. In addition to her contributions to the study of protein folding, Carol has conducted important work on ribosomes, molecular chaperones and most recently membrane proteins.
The first female Professor of Chemistry at both Oxford and Cambridge universities, in 2013 she was awarded the title of Dame Commander of the Order of the British Empire for her services to science. Carol was also the recipient of the Royal Society’s prestigious Rosalind Franklin Award and Davey Medal, in 2004 and 2010, respectively. In 2015, she was the European Laureate of the L’Oreal–UNESCO for Women in Science Award.
This example which uses the Physics of Fleming's lefthand rule to bend positive streams of ions in a magnetic field. They pass through an initial crossed E and B field to act as a velocity selector and then a second field to curve them. The more the mass is the ion the less they curve which means you can separate ions of different mass or isotopes.Show MoreMass Spectrometer 70-70F Manchester Science Museum
70-70F mass spectrometer, made by VG Micromass, Winsford, 1974 and used at the University of Oxford for research into the metabolites of cannabis, with associated manuals & research papers.
Carol Robinson ...is a chemist who has pioneered the application of mass spectrometry techniques to problems in chemical biology. Her groundbreaking research on the three-dimensional structure of proteins in particular has demonstrated the power of such techniques in studying large molecular compounds.
Much of her research has involved pushing the limits of electrospray mass spectrometry, demonstrating that important complexes can be generated and studied in the gas phase. In addition to her contributions to the study of protein folding, Carol has conducted important work on ribosomes, molecular chaperones and most recently membrane proteins.
The first female Professor of Chemistry at both Oxford and Cambridge universities, in 2013 she was awarded the title of Dame Commander of the Order of the British Empire for her services to science. Carol was also the recipient of the Royal Society’s prestigious Rosalind Franklin Award and Davey Medal, in 2004 and 2010, respectively. In 2015, she was the European Laureate of the L’Oreal–UNESCO for Women in Science Award.
This example which uses the Physics of Fleming's lefthand rule to bend positive streams of ions in a magnetic field. They pass through an initial crossed E and B field to act as a velocity selector and then a second field to curve them. The more the mass is the ion the less they curve which means you can separate ions of different mass or isotopes.Show More Amazing... Magic.... Induced Magnetism
This a little video about induced magnetism and how it works. The domains line up and the field is passed through the iron domains so they line up.
Fits into part ...6B of iGCSE PhysicsShow More Circular Electron Beam in Magnetic Field - A Level Physics
This is how you can work out e/m for circular beam of electrons thermionic emitted from a filament.
It uses both electric fields and mag fields and Helmholtz coils.
Photocopier Magnetic Toner
Perrin Tube - Electron Demo A2 AQA Mag Fields Discovery of the Electron and Charge
The stream of electrons or "cathode rays" are deflected into a Faraday cage, which is connected to an electroscope, to show that electrons have a negative charge.
It is important ...that the whole beam should enter the cylinder to avoid the production of secondary electrons by the beam striking the sides. For this reason it is more reliable to use the coils to deflect the beam than to do the experiment with a bar magnet deflecting the beam as I have done here.
You may find that the charge leaks away as soon as you remove the magnetic field that is causing the deflection. So it is best to view the effects live.
Result is to prove that cathode rays have a charge, which you can then go on to show is negative. Also that they have mass and obey the formulas used in A2 Physic for a particle moving in a B-field
Full instructions are shown here...
http://practicalphysics.org/perrin-tube-%E2%80%93-sign-electron-charge.htmlShow More Magnetic Field Lines Neodymium
Magnetic Fields with Neodymium magnet
Magic Magnetic forces balanced with gravitational forces
Magnetic Field lines balanced forces
How The Northern Lights Are Created VIDEO
Magnetic Fields, Flux Density & Motor Effect - GCSE & A-level Physics (full version)
http://scienceshorts.net Please don't forget to leave a like if you found this helpful!
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00:00 Magnetic field lines
04:51 Magnetic flux & flux density (field strength)
07:00 Field around current in wire
08:17 ...Motor effect, F=BIL, Fleming's left hand rule
15:04 Experiment -
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I don't charge anyone to watch my videos, so please donate if you can to keep me going! https://bit.ly/scienceshortsdonateShow More Working Principle of DC Motor (animation of elementary model)
Working Principle of DC Motor - Video gives an brief explanation in form of animation how does DC Motor works. Also you can view working principle on elementary ...model with poles, commutators, brushes, turns and what role in working principles has mechanical force.
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✅ ⚡ How a DC Motor Works? (Animation) ⚙️ - https://youtu.be/8R1vKZ3ObEA
PRINCIPLE OF DC MOTOR
This DC or direct current motor works on the principal, when a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move.
This is known as motoring action. If the direction of current in the wire is reversed, the direction of rotation also reverses. When magnetic field and electric field interact they produce a mechanical force, and based on that the working principle of DC motor is established.
The direction of rotation of a this motor is given by Fleming’s left hand rule, which states that if the index finger, middle finger and thumb of your left hand are extended mutually perpendicular to each other and if the index finger represents the direction of magnetic field, middle finger indicates the direction of current, then the thumb represents the direction in which force is experienced by the shaft of the DC motor.
Structurally and construction wise a direct current motor is exactly similar to a DC generator, but electrically it is just the opposite. Here we unlike a generator we supply electrical energy to the input port and derive mechanical energy from the output port
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This is how you can work out e/m for circular beam of electrons thermionic emitted from a filament.
It uses both electric fields and mag fields and Helmholtz coils.
E/M Fine beam Tube Exp 1 - A Level Physics
This demo shows how to balance an electric field and magnetic field for an accelerated electron to work out a charge to mass ratio.
Using Helmholtz Coils for mag field
Hall Effect - Sixty Symbols
Professor Roger Bowley is back in the lab explaining the Hall Effect, which involves electric current and magnetic fields.
More physics videos at
http://www.sixtysymbols.com/Hall Effect Explained, Electric & Magnetic Field, Drift Velocity & Charge Density Calculations
What is a cyclotron, the physics behind its working and why.
This video discusses the working of the cyclotron, the physics principles - the use of electric and magnetic fields to speed up charged particles - and uses the example ...of ANSTO National Research Cyclotron in Sydney in Australia.
SEE MY VIDEO ON THE ANSTO CYCLOTRON : https://youtu.be/ot11WgB6_zM
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facebook: @physicshigh
twitter: @physicshighShow More Ernest O. Lawrence Talks About the Evolution of the Cyclotron
In this video, Berkeley Lab Founder & Nobelist Ernest O. Lawrence can be heard talking about the evolution of the cyclotron & its potential for science with the host of ...the radio program, "The National Farm and Home Hour". According to Wikipedia, The National Farm & Home Hour was a variety show which was broadcast in various formats from 1928 to 1958. Aimed at listeners in rural America, it was known as "the farmer's bulletin board" & was produced by the United States Department of Agriculture. http://en.wikipedia.org/wiki/The_National_Farm_and_Home_HourShow More Ernest O. Lawrence & The Inspiration for the Cyclotron
Watch this video to learn what inspired Berkeley Lab founder and Nobelist Ernest O. Lawrence to create the first cyclotron.
Visualising Antimatter with Bubble Chambers - Christmas Lectures with Frank Close
Elettra. What is a synchrotron? How does it work? (English)
Video rendering by Arsenal S.r.l.
Mass spectrometry | Atomic structure and properties | AP Chemistry | Khan Academy
Keep going! Check out the next lesson and practice what you’re learning:
https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:mass-spectrometry-of-elements/a/isotopes-and-mass-spectrometry
In the analytical technique of mass spectrometry, atoms or molecules are ionized using a high-energy electron beam and then ...separated based on their mass-to-charge ratios (m/z). The results are presented as a mass spectrum, which shows the relative abundances of the ions on the y-axis and their m/z ratios on the x-axis. This data can be used to calculate the exact masses of the atoms or molecules in the sample. View more lessons or practice this subject at https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:mass-spectrometry-of-elements/v/mass-spectrometry
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Please visit twuphysics.org for videos and supplemental material by topic. These physics lesson videos include lectures, physics demonstrations, and problem-solving.
... Ms. Twu's AP Physics B / AP Physics 1 and 2 lesson videos are designed for students who have never had physics before. These videos are also used for "flipped classroom" teaching at Eleanor Roosevelt High School.
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