# STATIC ELECTRICITY

mind map on static electricity

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STATIC ELECTRICITY

## 1. Charges

### 1.1. types

1.1.1. Negative

1.1.1.1. E.G:amber & fur

1.1.1.2. The electrons transfer to objects

1.1.2. positive

1.1.2.1. E.G:glass & silk

1.1.2.2. electrons transfer away from objects.

### 1.2. When placed together.

1.2.1. negative with negative

1.2.2. positive with positive

1.2.2.1. repel

1.2.3. positive with negative

1.2.3.1. attract

### 1.3. SI unit

1.3.1. coulomb

1.3.1.1. 6.24 x 10^18 charges

## 2. charging

### 2.1. by rubbing

2.1.1. Amber & fur

2.1.1.1. electrons move from fur to the amber

2.1.1.2. amber=negative

2.1.1.3. fur = positive

### 2.2. By induction

2.2.1. Production of an electric charge on the surface of a conductor under the influence of an electric field.

## 3. Electric field

### 3.2. to sketch

3.2.1. must begin from positive charges to negative charges

3.2.2. no 2 field lines can cross

3.2.3. number of lines drawn leaving a positive charge or ending at a negative charge is proportional to the carge

### 3.3. pictures

3.3.1. positive & negative

3.3.2. positive & positive

3.3.3. negative &negative

## 4. hazards of electrostatics

### 4.1. objects may get charged due to build up of charges

4.1.1. clothing by synthetic fibres may get charged easily, in dry environments may cause sparks resulting in a fire

4.1.2. rotating tyres=negative charge. metal body near it may become positively charged->sparks produced ma ignite highly flamable load(petrol)

## 5. applications of electrostatics

### 5.1. photocopier

5.1.1. page 290 of text book

### 5.3. electrostatic paint spraying

5.3.1. give even coating of paint on a car

### 5.4. electrostatic precipitator

5.4.1. clean smoke coming out from industrial chimneys

5.4.2. page 292 of text book