A small, positively charged bead hangs on a thread.
A charged sphere is brought close to the bead. The bead moves away from the sphere without touching it.
Which statement explains why the bead moves?
The sphere is negative, and its electric field exerts a force on the bead
The sphere is positive, and its electric field exerts a force on the bead
The sphere is positive, and electrons flow through the air to the bead
The sphere is negative, and protons flow through the air to the bead
43 exam-style questions on OCR GCSE Physics 3.1 Static and charge, covering 3.1.1 Positive and negative charge, 3.1.2 Static electricity and forces between charged objects, 3.1.3 Electron transfer and static electricity, 3.1.4 Electric fields, 3.1.5 Current as a flow of charge, 3.1.6 Current in a single closed loop, and 3.1.7 Charge, current and time. Each one has a worked solution and a mark scheme showing where the marks go.