In an electrostatic laboratory demonstration, a student charges a polythene rod and an acetate rod by rubbing them with different dry cloths.
The magnitude of the charge on the polythene rod is 54 nC54\text{ nC}54 nC.
The magnitude of the charge on the acetate rod is 120 nC120\text{ nC}120 nC.
Calculate the percentage of charge on the polythene rod compared with the charge on the acetate rod.
Use the equation:
percentage of charge=charge on polythene rodcharge on acetate rod×100 \text{percentage of charge} = \frac{\text{charge on polythene rod}}{\text{charge on acetate rod}} \times 100 percentage of charge=charge on acetate rodcharge on polythene rod×10047 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction, covering 11.1.1 Charging insulators by friction, 11.1.2 Forces between charges, 11.1.3 Electrostatic phenomena, and 11.1.4 Earthing and removing charge. Each one has a worked solution and a mark scheme showing where the marks go.