It should be noted that a negative force using the equation above indicates that the force is attractive, and a positive force indicates that it is repulsive. Each type of material allows electric charge to flow through it to a certain extent. The measure of how receptive a material is to electric current is called the conductivity. Those materials with a high conductivity are called conductors. Those with a low cuductivity are called insulators.
All materials have a certain conductivity.
The conductivity of a material depends on the materials arrangement of free electrons. Below is a chart of some common materials and their conductivities. The human body acts as a conductor. The human body has a large enough conductivity so that it is considered to be a conductor. For this reason, it is ill-advised to plug in a radio while taking a bath.