Speca › Topics › GCSE Combined Science

What is in this bundle

• Assessment mark schemeWord, editable
• End-of-topic assessmentWord, editable
• HomeworkWord, editable
• Retrieval-practice quizzesWord, editable
• SlidesPowerPoint, editable
• Starter & exit ticketWord, editable
• Tiered worksheetWord, editable
• Worksheet mark schemeWord, editable

Foundation and Higher tier

• Explain that a magnet's poles are where its magnetic force is strongest, that two magnets brought close together exert a force on each other (like poles repel, unlike poles attract), and that this attraction/repulsion is a non-contact force; distinguish a permanent magnet (produces its own magnetic field) from an induced magnet (becomes magnetic only while in a magnetic field, always experiencing attraction, and quickly losing most/all magnetism once removed).
• Define a magnetic field as the region around a magnet where it exerts a force on another magnet or on a magnetic material (iron, steel, cobalt, nickel): the force between a magnet and a magnetic material is always attractive; explain that field strength depends on distance from the magnet (strongest at the poles), and that field direction at a point is the direction of force on a north pole placed there, with field lines running from a magnet's north to its south pole.
• Describe how a compass (containing a small bar magnet) works, and explain how it relates to evidence that Earth's core is magnetic; describe how to plot a magnet's field pattern using a compass, and draw a bar magnet's field pattern showing how strength and direction vary from point to point.
• Explain that current flowing through a conducting wire produces a magnetic field around it, whose strength depends on the current and the distance from the wire; explain that shaping the wire into a solenoid strengthens and evens out the field (uniform and strong inside the solenoid, with a field shape outside similar to a bar magnet's), and that adding an iron core further strengthens it, forming an electromagnet; describe how to demonstrate a current's magnetic effect, draw the field pattern (with direction) for a straight current-carrying wire and for a solenoid, and explain how the solenoid arrangement increases the current's magnetic effect.

Higher tier only

• Define the motor effect: a current-carrying conductor placed in a magnetic field experiences a force from (and exerts a force on) the magnet producing that field; use Fleming's left-hand rule to represent the relative directions of the force, the current, and the magnetic field, and recall the factors affecting the force's size.
• Use F = B × I × l (force in newtons; magnetic flux density in tesla; current in amperes; length in metres: supplied on the physics equation sheet) for a conductor at right angles to a magnetic field.
• Explain how the force on a current-carrying conductor in a magnetic field causes a current-carrying coil to rotate, as the basis of an electric motor.

Required practicals

None: this topic has no required practical activity attached in the specification.

Where students go wrong

• Believing an induced magnet can repel the magnet inducing it, rather than understanding induced magnetism always produces attraction, never repulsion.
• Drawing magnetic field lines in the wrong direction, particularly forgetting the convention that field lines point from north to south outside the magnet.
• Assuming a solenoid's field is identical in every respect to a bar magnet's, rather than understanding the similarity is specifically about the field's overall shape, not its underlying cause (current vs permanent magnetisation).
• Confusing which factors affect an electromagnet's strength: current, distance, presence of an iron core, and (for a solenoid) the coil arrangement all matter, but not all in the same way.
• (Higher tier) Misapplying Fleming's left-hand rule by using the wrong hand or mismatching which finger represents force, field, and current.

How it gets asked in the exam

"Describe the difference between a permanent and an induced magnet", "Draw the magnetic field pattern around a bar magnet/current-carrying wire/solenoid", "Explain how you would increase the strength of an electromagnet", "Use Fleming's left-hand rule to find the direction of the force" (Higher), "Calculate the force on a conductor using F = BIl" (Higher), "Explain how a current-carrying coil in a magnetic field produces rotation" (Higher).

Key vocabulary

Magnetic pole, magnetic field, permanent magnet, induced magnet, solenoid, electromagnet, motor effect (HT), Fleming's left-hand rule (HT), magnetic flux density (HT).

Assumed prior knowledge

• Current and circuit basics from Electricity (this taxonomy's topic 19): electromagnetism directly connects magnetic fields to current flow.
• Non-contact forces from Forces, Interactions, Work Done and Elasticity (this taxonomy's topic 22), magnetic attraction/repulsion is one of the named examples there.
• (Higher tier) Comfort rearranging and substituting into formulae for the motor-effect force equation.

How Speca scaffolds this topic

• A single, consistently drawn magnetic field-line convention (arrows from north to south, density of lines showing field strength) used across every diagram, bar magnet, straight wire, solenoid, so students transfer one visual rule across increasingly complex field shapes rather than learning a new drawing convention each time.
• A permanent-vs-induced magnetism comparison table (what causes it, whether it can repel, what happens when the field is removed) mirrors the comparison-table approach used consistently elsewhere in this taxonomy for closely related but genuinely distinct concepts.
• The solenoid-to-electromagnet progression benefits from a step-by-step visual sequence (straight wire → coiled into a solenoid → iron core added) showing the field getting stronger and more concentrated at each stage, rather than presenting the finished electromagnet without the intermediate reasoning.
• (Higher tier) Fleming's left-hand rule benefits from a large, consistently labelled hand diagram (thumb = force/motion, first finger = field, second finger = current) displayed and referred to identically in every worked example, since correct finger assignment, not the underlying physics, is the most common source of error here.

More GCSE Combined Science topics

• Cell Biology8 resources
• Organisation8 resources
• Infection and Response8 resources
• Bioenergetics8 resources
• Homeostasis and Response8 resources
• Inheritance, Variation and Evolution8 resources
• Ecology8 resources
• Atomic Structure and the Periodic Table8 resources