During a laboratory model of fuel transfer, an insulated metal vessel continually gains electrons. An earthing wire is attached before transfer begins. Halfway through, the wire breaks.
Which describes the charge on the vessel after the break, and the resulting risk?
Negative charge can build up; a later discharge may produce a spark.
Positive charge can build up; a later discharge may produce a spark.
Negative charge can build up; a later discharge cannot produce a spark.
Positive charge can build up; a later discharge cannot produce a spark.
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.