Electroscope and Motion of Particles

An **electroscope** is a device we can use for a detection of **electric charges** as it utilizes their **attraction and repulsion**. In the model, we can see an experiment, when the electroscope connector is touched with a **positively-charged glass rod**. Upon touching there will be a **charge equalization** between the glass rod and the metal rod and pointer of the electroscope. That is that the electrons will travel to the glass rod. Thus, the pointer and the metal rod are **positively-charged** and will **repel each other**.



The electroscope was the first electrical measuring instrument. The first electroscope, a pivoted needle called the **versorium**, was invented by **William Gilbert** around **1600**.



The **pith-ball electroscope** and the **gold-leaf electroscope** are two classical types of electroscope that are still used in physics education to demonstrate the principles of electrostatics. A certain type of electroscope is also used in the **quartz fiber radiation dosimeter**.