A metal fuel can stands on a plastic sheet while it is filled with fuel.
As the fuel flows in, the can gains a negative charge.
Explain why the negative charge stays on the can.
The can is then connected to earth with a metal wire.
Describe how the metal wire removes the negative charge from the can.
In a second test, a different can gains a positive charge.
Describe how earthing makes this can neutral.
A student says:
'When the positively charged can is earthed, positive charges flow from the can to the earth.'
Explain why the student is wrong.
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.