could perform to demonstrate that the soft-iron bolt can function as a temporary induced magnet.","markscheme":"- Place the permanent neodymium magnet in contact with, or very close to, one end of the soft-iron bolt M1\n- Bring the opposite end of the soft-iron bolt into contact with the steel hex nuts to demonstrate that they are attracted and cling to the bolt A1\n- Remove the neodymium magnet from the bolt and observe that the hex nuts detach and fall off, showing that the induced magnetism is temporary A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"induced_magnetism","label":"Test temporary magnetism","steps":[{"type":"text","order":1,"title":"Induce magnetism","content":"Hold the permanent neodymium magnet **in contact with, or very close to, one end** of the soft-iron bolt.\n\nThis makes the bolt an **induced magnet**: the magnet causes its magnetic domains (tiny regions that act like magnets) to line up. **This setup earns M1.**","highlights":[{"text":"high-strength neodymium block magnet, an unmagnetized soft-iron bolt","location":"specification"}]},{"type":"text","order":2,"title":"Test the far end","content":"Keeping the neodymium magnet in place, touch the **opposite end** of the bolt to the steel hex nuts.\n\nThe nuts should be attracted and cling to the bolt. This observation shows that the bolt is acting as a magnet, earning **A1**.","highlights":[{"text":"tray of small steel hex nuts","location":"specification"}]},{"type":"text","order":3,"title":"Remove the magnet","content":"Now remove the neodymium magnet from the bolt and watch the nuts.\n\nThe nuts detach and fall off because soft iron loses most of its induced magnetism once the permanent magnet is removed. This proves the magnetism was **temporary** and earns the final **A1**.","highlights":[{"text":"temporary induced magnet","location":"specification"}]}]}],"generatedAt":"2026-07-22T09:23:17.652Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"30beffc8-1251-4783-bc4c-afd9042d26d5","revisionId":"f3e968e4-cc71-4343-90fe-4c0dd32811f5","questionNumber":null,"questionType":"LA","specification":"A student sets up the apparatus shown in Figure 1 to study electromagnetic attraction.\n\n![Figure 1: An electromagnet is clamped securely to a stand. Directly below it, a block of ferromagnetic steel is placed on an electronic top-pan balance. The electromagnet is connected in series with a variable power supply and an ammeter.](https://assets.mathsgenie.co.uk/aqa-qb/341b0564-ca89-4a43-83b7-9dcb4c5ae640.png)","difficulty":7,"difficultyBand":"medium","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"bf6c90dc-f069-448a-bd17-7a0263a7052f","label":null,"content":"Describe how the student could use this apparatus to investigate how the size of the current in the electromagnet affects the force of attraction between the electromagnet and the steel block.","markscheme":"- **Baseline Measurement:** Measure and record the initial mass reading on the electronic balance when the current is $0\\text{ A}$ (or tare/zero the balance with the block in place while the current is $0\\text{ A}$) B1\n- **Varying the Independent Variable:** Switch on the power supply and adjust it to set a specific current, reading the precise value from the ammeter B1\n- **Measuring the Dependent Variable:** Record the new reading on the balance and calculate the decrease in mass, $\\Delta m$ (where the attractive force is calculated using $F = \\Delta m \\cdot g$) B1\n- **Control and Range:** Repeat the procedure for a range of at least five different current values, ensuring the height of the clamped electromagnet (the size of the air gap) remains constant B1","marks":4,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"balance_method","label":"Balance-reading method","steps":[{"type":"text","order":1,"title":"Record the base

Magnets and magnetic fields

Question 9

Magnets and magnetic fields Questions

Magnets and magnetic fields

Question 9

Magnets and magnetic fields Questions