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0.2.1 Which diagram shows the magnetic field pattern around a bar magnet? Tick one box - AQA - GCSE Physics Combined Science - Question 2 - 2018 - Paper 2
Question 2
0.2.1 Which diagram shows the magnetic field pattern around a bar magnet? Tick one box. 0.2.2 Figure 3 shows three metal blocks. The blocks are not labelled. One... show full transcript
Worked Solution & Example Answer:0.2.1 Which diagram shows the magnetic field pattern around a bar magnet? Tick one box - AQA - GCSE Physics Combined Science - Question 2 - 2018 - Paper 2
Step 1
Step 2
Describe how another permanent magnet can be used to identify the blocks.
Answer
A second permanent magnet can be used to identify the blocks by approaching each one sequentially. The block that is attracted to the second magnet is the iron block, while the block that is repelled is the permanent magnet itself. The aluminium block will show no response to the magnet, as it is not magnetic.
Step 3
Explain how this electromagnet is able to pick up and move the blocks.
Answer
The electromagnet operates by completing an electrical circuit, which activates the electromagnet. Once the circuit is closed, a current flows through the coil of wire wrapped around an iron core, inducing a magnetic field. This causes the iron core to become magnetized, allowing it to attract and hold magnetic materials like the blocks. Additionally, when the circuit is switched off, the current flow ceases, which deactivates the electromagnet and releases the blocks.