A technician assembling circuit boards becomes charged as their clothing rubs against their chair. A discharge from the technician through a microchip could destroy it.
Which arrangement stops charge building up on the technician for the whole time the microchips are being handled?
The technician wears rubber gloves while working at an earthed metal workbench.
The technician wears a wrist strap joined to an earthed point by a conducting lead.
The technician stands on a thick rubber mat so that no charge flows through their feet.
The technician touches an earthed metal plate once, just before handling begins.
80 exam-style questions on Edexcel GCSE Physics 11.2 Uses, dangers and electric fields, covering 11.2.1 Uses of electrostatic charge, 11.2.2 Dangers of sparking, 11.2.3 Electric fields, and 11.2.4 Electric fields and static electricity. Each one has a worked solution and a mark scheme showing where the marks go.