A technician maps the magnetic field around an electromagnet. At position R, neighbouring field lines are 3 mm apart. At position S, they are 8 mm apart.
Which position has the stronger magnetic field?
The field is equally strong at both positions
The field strength cannot be compared from the spacing
Position S
Position R
70 exam-style questions on Edexcel GCSE Physics 12.1 Magnets and magnetic fields, covering 12.1.1 Magnetic poles, 12.1.2 Magnetic materials; permanent and induced magnets, 12.1.3 Magnetic fields, and 12.1.4 Plotting compasses and the Earth's magnetic field. Each one has a worked solution and a mark scheme showing where the marks go.