# Static electricity.

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Static electricity.

## 1. definition.

### 1.1. Any electric charge. SI unit:coulomb(C)

1.1.1. postive charge e.g Glass(rubbed with silk)

1.1.2. negative charge e.g. Rubber(rubbed with fur)

1.1.3. They both obey laws of electrostatics. Like charges repel;unlikes charges attract.

## 2. electric field

### 2.1. An electric field is a region in which electric charge experiences a force.

2.1.1. To sketch the combine electric field,the electric lines of force are drawn by the following the rules below: 1)The lines must begin from positive charges and end on negative charges. 2)The number of lines drawn leaving a positive charge or ending on a negative charge is proportional to the magnitude of the charge 3)No two field lines can cross each other.

## 3. Uses of static electricity:

3.1.1. New node

3.2.1. New node

### 3.3. automobile painting

3.3.1. Some automobile manufacturers use static electricity to help them paint the cars they make. The way this works is that they first prepare the car's surface and then put it in a paint booth. Next, they give the paint an electrical charge and then spray a fine mist of paint into the booth. The charged paint particles are attracted to the car and stick to the body, just like a charged balloon sticks to a wall. Once the paint dries, it sticks much better to the car and is smoother because it is evenly distributed.