Photo AI
2 (a) Figure 1 shows the magnetic field produced by a current in a long, straight wire - Edexcel - GCSE Physics Combined Science - Question 2 - 2018 - Paper 1
Question 2
2 (a) Figure 1 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... show full transcript
Worked Solution & Example Answer:2 (a) Figure 1 shows the magnetic field produced by a current in a long, straight wire - Edexcel - GCSE Physics Combined Science - Question 2 - 2018 - Paper 1
Step 1
Which row of the table is correct when the strength of the magnetic field is greatest?
Answer
Based on the principles of electromagnetism, the strength of the magnetic field produced by a current-carrying wire is inversely related to the distance from the wire and directly related to the magnitude of the current. Therefore, the magnetic field strength is greatest when the distance from the wire is small, and the current is large. This leads us to the correct answer, which is Row B: small distance and large current.
Step 2
Which of these materials would be the most suitable for making a temporary magnet?
Answer
The most suitable material for making a temporary magnet is iron (Option B). This is because iron can easily be magnetized and demagnetized, making it ideal for temporary magnets. Other options, such as copper and plastic, are non-magnetic, while steel is generally a permanent magnet material.