A student rubs a polythene rod with a dry woolen cloth. This process gives the polythene rod a net negative charge of −8.0 nC-8.0\text{ nC}−8.0 nC.
Which of the following statements correctly explains the cause of this overall charge and identifies the quantity of charge carriers transferred?
Electrons have been transferred from the cloth to the polythene rod; specifically, 5.0×10105.0 \times 10^{10}5.0×1010 electrons were added to the rod.
Electrons have been transferred from the polythene rod to the cloth; specifically, 5.0×10105.0 \times 10^{10}5.0×1010 electrons were removed from the rod.
Protons have been transferred from the cloth to the polythene rod; specifically, 5.0×10105.0 \times 10^{10}5.0×1010 protons were added to the rod.
Electrons have been transferred from the cloth to the polythene rod; specifically, 1.3×10−271.3 \times 10^{-27}1.3×10−27 electrons were added to the rod.
47 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction. Each one has a worked solution and a mark scheme showing where the marks go.