In an industrial flour mill, dry flour is pneumatically transported at high speed through a series of metal pipes into a large storage silo. As the dry flour particles rub against the inner walls of the pipes, the pipes and the silo can become electrostatically charged.
Explain how the mill operators can prevent a build-up of static charge on the pipes and silo, and why this safety measure is essential in this environment.
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.