Static Electricity

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Static Electricity by Mind Map: Static Electricity

1. Laws of Electrostatics

1.1. Like charges repel

1.2. Unlike Charges Attract

2. Methods of charging

2.1. By rubbing: One material loses electrons and becomes positive. The other material gains electrons and becomes more negative

2.1.1. Friction causes electrons to jump from one material to another

2.2. By induction: A charged object A is brought near an uncharged object B (they do not touch). The object B is now earthed, and it loses/gains electrons. The earth connection is removed, and the charged object A is moved away from object B. Object B is now charged.

2.2.1. The charge on B is always the opposite of the initial charge of A. For example, if A was negatively charged, B will remain with a positive charge at thee end of charging.

2.2.2. The objects do not touch

3. How to detect charge?

3.1. Gold Leaf Electroscope

4. Applications

4.1. Paint Spraying

4.2. Electrostatic Precipitator

4.3. Photocopy Machine

4.4. Inkjet Printer

5. Dangers

5.1. Sparks can ignite fuel (aircraft and car fueling)

5.1.1. Vehicle is earthed before refueling

5.2. Charge can build up in machines with moving parts (fridge, air conditioner)

5.2.1. The casing of the machine is connected to earth, to neutralise any charge build-up