# STATIC ELECTRICITY BY DUNCAN LIM 4S3

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STATIC ELECTRICITY BY DUNCAN LIM 4S3

## 1. Charge

1.1.1. Positive

1.1.2. Negative

### 1.3. Like charges repel

1.3.1. Negative + Negative = repulsion

1.3.2. Positive + Positive = repulsion

### 1.4. Unlike charges attract

1.4.1. Positive + Negative = Attraction

## 2. Ways of charging

### 2.1. Charge by rubbing

2.1.1. Charge is transferred form one object to another object

2.1.2. E.g. Rubbing an amber rod with fur

2.1.2.1. Amber becomes negatively charged

2.1.2.2. Fur is positively charged

### 2.2. Charge by induction

2.2.1. NO loss of charge

2.2.2. Earthing process

2.2.2.1. Electrons from Earth flow to conductor

2.2.2.2. Electrons flow from conductor back to Earth

## 3. Electric Field

### 3.1. What is it?

3.1.1. A region which an electric charge experiences a force

### 3.2. Dipole

3.2.1. Positive

3.2.1.1. Electric field line are moving AWAY from the charge

3.2.2. Negative

3.2.2.1. Electric field lines are moving TOWARDS the charge

### 3.3. Sketching

3.3.1. Lines start from positive and end at negative

3.3.2. Field lines CANNOT cross each other

3.3.3. Number of field lines is proportional to the magnitude of charge