A compass near a steel cabinet points north-east. The same compass in an open area points approximately north. It returns to each direction when disturbed. Which conclusion is best supported?
A local magnetic influence changes the indoor reading; the outdoor reading follows Earth’s field.
A local gravitational influence changes the indoor reading; the outdoor reading follows Earth’s field.
A local magnetic influence changes the indoor reading; the outdoor reading follows Earth’s gravity.
A local gravitational influence changes the indoor reading; the outdoor reading follows Earth’s gravity.
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.