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Figure 4 shows the magnetic field produced by a current in a long, straight wire - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1
Question 3
Figure 4 shows the magnetic field produced by a current in a long, straight wire. Which row of the table is correct when the strength of the magnetic field is great... show full transcript
Worked Solution & Example Answer:Figure 4 shows the magnetic field produced by a current in a long, straight wire - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1
Step 1
Which row of the table is correct when the strength of the magnetic field is greatest?
Answer
In a long, straight wire, the strength of the magnetic field produced is inversely proportional to the distance from the wire and directly proportional to the current. Therefore, the greatest strength of the magnetic field occurs when the distance from the wire is 'small' and the current is 'large'. This corresponds to option B in the table.
Step 2
Which of these materials would be the most suitable for making a temporary magnet?
Answer
Among the options provided, iron is the most suitable material for making a temporary magnet. This is because iron is a ferromagnetic material that can gain and lose magnetism easily, making it ideal for temporary magnets.