TJC 2023 IP4 Static Electricity Notes

TJC IP4 PHYSICS 2023 IP4 TOPIC 11 – Static Electricity 1 of 11 TOPIC 11 – STATIC ELECTRICITY Content: • Laws of electrostatics • Principles of electrostatics • Electric field • Applications of electrostatics Learning Outcomes: Candidates should be able to: (a) state that there are positive and negative charges and that charge is measured in coulombs (b) state that unlike charges attract and like charges repel (c) describe an electric field as a region in which an electric charge experiences a force (d) draw the electric field of an isolated point charge and recall that the direction of the field lines gives the direction of the force acting on a positive test charge (e) draw the electric field pattern between two isolated point charges (f) show understanding that electrostatic charging by rubbing involves a transfer of electrons (g) describe experiments to show electrostatic charging by induction (h) describe examples where electrostatic charging may be a potential hazard (i) describe the use of electrostatic charging in a photocopier, and apply the use of electrostatic charging to new situations Essential Questions: By the end of the lesson, students should be able to answer the questions: 1. What are the different types of charges existing? 2. What are the interactions between charges? 3. How can you charge an object? 4. How can you distinguish between the types of charges? 5. What are the possible hazards of charges?

TJC IP4 PHYSICS 2023 IP4 TOPIC 11 – Static Electricity 2 of 11 TRIGGER: http://www.express.co.uk/news/uk/265646/The-girl-13-who-could-die-if-she-combs-her-hair Megan Stewart, 13, has a rare condition, Hair Brushing Syndrome, which means she must avoid wearing polyester or touching balloons. Any contact with electrical charges could confuse her brain into switching itself off or sending signals to her heart and lungs to make them do so. Megan has to dampen her hair to reduce static and lie down before combing it and is banned from taking part in school science experiments. The teenager, from Wishaw, Lanarkshire, was diagnosed three years ago, after she collapsed as her mother ¬Sharon brushed her hair. Mrs Stewart, 41, said: “I was brushing her hair when she flopped over and her lips turned blue. I thought she was having a fit, so we called the paramedics. It was really scary.” Megan was taken to Wishaw General Hospital where medics revived her. Neurologists made the diagnosis two months later. Doctors at the Royal Hospital for Sick Children at Yorkhill in Glasgow, believe birth complications may be responsible for the condition. Megan was born three months prematurely, weighing just 2lb 5oz wit h a diaphragmatic hernia, a hole in her stomach leading right up into her chest, which only allowed space for only one lung to grow. She spent the first 18 months of her life in hospital. She also suffers from asthma and dorsal stream dysfunction, a