1.1. A forensic scientist uses an electrostatic dust print lifter (EDPL) to take impressions of footprints. The diagram shows a  simplified EDPL and a description of how it works.

Use the idea of charge movement to explain how the lifting sheet becomes negatively charged and the metal plate becomes positively charged.

1.2. The photograph shows a typical dust print on a lifting sheet.

Suggest why dust particles are lifted off the floor on to the lifting sheet.

1.3. This photograph shows a charged polythene rod placed next to a stream of water flowing from a tap.

Suggest why water is deflected.