May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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32Magnetic Fields CurrentsMedium1 mark
A student investigates the magnetic field caused by a current of 2 A in a straight wire. The student measures the magnetic field strength at different distances from the straight wire. The student then repeats the experiment using a current of 4 A in the same wire.
four graphs of magnetic field strength against distance from the wire for I = 2 A (dashed) and I = 4 A (solid): A both straight lines rising from a positive intercept; B both horizontal straight lines; C and D both pairs of curves falling from a high value and levelling off, with the I = 4 A curve below the I = 2 A curve in C and above it in D
Which graph represents the pattern in the student’s data?