A researcher is using a magnetic field sensor to investigate the magnetic field strength at a point in the empty space surrounding a long, straight conductor carrying a stable electric current.
State one physical parameter, other than the current, that can be altered to change the magnitude of the magnetic field strength measured by the sensor.
30 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.