English National Curriculum - Science

Magnetic fields of electric currents

Mission Objectives

Describe how the strength of the magnetic field varies with the size of the current in a wire and the distance from the wire

Explain how to make an electromagnet and how the strength of it can be changed

Explain what a solenoid is and draw the magnetic field around one

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Keywords

Words and meanings to learn

magnetic field

the region around a magnet or a current-carrying wire where magnetic forces can be detected

current

the flow of electric charge through a conductor, typically measured in amperes (A)

solenoid

a coil of wire with many turns that produces a magnetic field when an electric current flows through it

electromagnet

a magnet created when a current flows through a solenoid, often with a core of magnetic material (like iron) to strengthen the magnetic field

concentric circle

objects or shapes that share the same center or axis; in the context of magnetic fields, concentric circles represent the magnetic field lines around a current-carrying wire

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This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator whose current work centres on curriculum design and professional development, supporting teachers to deliver high-quality science education through evidence-informed approaches. She is a former Head of Chemistry and Sixth Form Tutor with extensive Key Stage 4 and 5 experience, and has worked as an AQA examiner, giving her valuable insight into assessment standards and what students need to succeed.

Underpinning this is a strong foundation in applied science built across a range of industry roles. Samantha has held scientific roles at John Smith's Brewery, Yorkshire Water and WasteCare, where she led technical projects, drove operational efficiencies and ensured compliance with industry standards. Across these roles she has first-hand experience of how scientific knowledge translates into measurable outcomes in professional and commercial environments.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket. 

Required Resources

Making an electromagnet.

Magnetic field around a wire demo.

Large stiff wire, powerpack, clamp stands, card and plotting compasses.

Power packs, wire with stripped ends to make coils, iron cores (nails), paper clips, leads and croc clips (premade coils can help with timings).

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