Electromagnetic fields

  • force on a straight wire and force on a moving charge in a uniform field
  • flux and electromagnetic induction: concept and definition
  • Faraday’s and Lenz’s laws
  • emf equals rate of change of magnetic flux linkage

Within this list you will find a variety of different resources to help construct teaching sequences for the topic of electromagnetism. Students will have come across some of the ideas at GCSE, but there is an increased quantitative aspect to this topic at A level and it is important that students are familiar with the idea of the electromagnetic fields.

In particular this list is useful to those looking for practical ideas and opportunities that allow students to explore the topic of electromagnetism for themselves. There are also links to contexts to teach electromagnetism in. It is useful if students realise the Earth is a magnetic field. There can therefore be natural phenomena as a result of this, such as the aurora, and some exam questions may ask about phenomena like the eddie currents in aeroplane wings.

Whilst this list provides a source of information and ideas for experimental work, it is important to note that recommendations can date very quickly. Do NOT follow suggestions which conflict with current advice from CLEAPSS or recent safety guides. eLibrary users are responsible for ensuring that any activity, including practical work, which they carry out is consistent with current regulations related to Health and Safety and that they carry an appropriate risk assessment. Further information is provided in our Health and Safety guidance.

Links and Resources

Episode 410: Preparation for Electromagnetism Topic *suitable for home teaching*

This item from the Teaching Advancing Physics resources  provides links to  a number of lessons available to teach electromagnetism.

The topics covered are:

Episode 411: Describing magnetic fields

Episode 412: Force on a conductor in a magnetic field

Episode 413: Force on a charged particle (F = Bqv)

Episode 414: Electromagnetic induction, flux and flux linkage

Episode 415: Electric motors

Episode 416: Generators and transformers

The lessons contain practical ideas and suggestions, questions to ask, explanations and analogies. They also contain useful diagrams to aid explanations and problem sheets with worked examples.

This resource is useful to anyone building a scheme of work, or those not confident in teaching the electromagnetism topics. However, it is also useful for experienced practitioners looking for alternative ways to explain a topic, additional problems for students to answer or other practical ideas.

publication year
2000 - 2009

1 file

0

0

What Causes the Aurora? *suitable for home teaching*

This is a  useful resource for those wanting to give another context to magnetic fields and how they interact with charged particles. The article brings together a range of physics concepts and may be useful to support cross-topic thinking ready for terminal and summary examination papers. 

It could be used to introduce the topic of electromagnetism, or it could be used as part of revision, by asking students to use the context to write examination style questions to test their classmates.

The article would be useful to use with those students who need to continue to develop their vocabulary, such as EAL students, who could underline and add unfamiliar language to vocabulary lists, or for use with those students who find space an engaging context to learn physics. 

 

publication year
2010 to 2019

1 file

0

0

Magnetic Resonance Imaging (MRI)

Taken from the Institute of Physics lecture series, this resource concentrates on the context of magnetic resonance imaging. Included are teacher notes, a presentation and a student activity. 

The activity makes a link between electromagnetism and electromagnetic radiation, which may be useful to review when revising for terminal examinations. The activity sheet itself is not very challenging, but it could be used at the start of the topic while revising what students have learned at GCSE. 

publication year
2010 to 2019

3 files

1

0

Electromagnetic Induction *suitable for home teaching*

This three minute video shows how to demonstrate electromagnetic induction using spinning magnets, a wire coil and a lamp.

Spinning the magnets past the coil produces an electric current and lights the lamp.

This resource not only provides an idea for a useful piece of equipment, but also Alom Shaha describes the principles of electromagnetic induction and how to use the bulb to qualitiatively see the impact of changing the factors that affect the induced voltage. It would be particularly useful for creative technicians.

publication year
2010 to 2019

0 files

1

0

Electric Motor

This is a useful short video showing how to make a very simple electric motor. It can be used to introduce the idea that a current-carrying wire will experience a force in a magnetic field. The demonstration is simple, and the motor easier to construct than other traditional kits. This demonstration can be used to introduce the idea of flemming's left hand rule as students who may not have come across this concept before. 

An alternative method is also suggested.

publication year
2010 to 2019

0 files

14

3

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