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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.


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


What to do


Magnetic Field of a Straight Current-Carrying Wire

Change direction of current, see field lines, compass


Charged particle in an magnetic field

Change field, charge, velocity, mass, see path of charge


A charged particle moving in three dimensions

See spiral path of particle in magentic field, change, rotate view


A cyclotron

Cyclotron, change electric/magnetic field, see path


Charge Moving Through Magnetic Field Lab

Change charge, field, speed,  see path of particle


Mass spectrometer

Build up to mass spectrometer with velocity selector, accelerator, mass selector


The force on a charged particle in a magnetic field

Change q, v, B, see paths of particles


DC motor

Change field, p.d., number of loops, see forces, current


Direct current electrical motor

Change direction, see current, force, field for LHR


Lorentz force

Change current direction, field, see force on a wire


Electric motor

See motor spin with force and field


Electric motor quiz

Label an electric motor


Circuit construction kit – PhET

Build circuits with capacitors and inductors


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.
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