BMAT Physics Practice Test Questions and Answers

What causes the accumulation of charge? Describe the types of materials that can gain charge How can one 'charge ' an object? -The gain or loss of electron -Insulators -Through friction Like charges... Repel Unlike charges... Attract Hazards of static electricity -Static electricity can build up in clouds. This causes lightning - a flow of charge through the atmosphere -It is dangerous when there are flammable gases or a high concentration of oxygen. A spark could ignite the gases and cause an explosion. -Charge flows through body when touching a statically charged object-electric shock. This could cause burns/ death/ stop heart -Refuelling aircrafts sparking -air between two objects becomes ionised by a large voltage and therefore starts conducting. -Two charged objects, that have air between them, can discharge by a spark between them. How can use rectify the hazard of a build up of electrostatic charge? By earthing the materials Light source Cell Battery Resistor Variable resistor Ammeter