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Which of these factors affects the strength of the magnetic field around a current-carrying wire? A Direction of the current only B Size of the current only C Distance from the wire only D Size of the current and distance from the wire Your answer - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 3
Question 5
Which of these factors affects the strength of the magnetic field around a current-carrying wire? A Direction of the current only B Size of the current only C Dis... show full transcript
Worked Solution & Example Answer:Which of these factors affects the strength of the magnetic field around a current-carrying wire? A Direction of the current only B Size of the current only C Distance from the wire only D Size of the current and distance from the wire Your answer - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 3
Step 1
D Size of the current and distance from the wire
Answer
The strength of the magnetic field around a current-carrying wire is affected by both the size of the current and the distance from the wire. The magnetic field ( ext{B}) created by a long straight conductor can be determined by Ampère's law, which states that the magnetic field is directly proportional to the current and inversely proportional to the distance from the wire. Therefore, both the size of the current and its distance from the wire play crucial roles in determining the strength of the magnetic field.